{"title":"3.26 Color-Change Gemstones","description":"","products":[{"product_id":"color-change-spinel-ring-5-97-carats","title":"Color-Change Spinel Ring, 5.97 Carats","description":"Possessing the remarkable ability to change color under different light conditions, the spinel at the center of this ring is an exceptional rarity in the world of colored gemstones. Color-change spinels weighing over one carat are very rarely found, and this example totals a remarkable 5.97 carats. The oval brilliant cut gem displays a deep blue hue when viewed in daylight and an equally stunning deep purple when viewed in incandescent light, and it is graded as entirely untreated by the accompanying GIA report. The spinel is encircled by a diamond halo totaling 0.56 carat and set in classic 18K white gold. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Cert_31-4564.pdf\" target=\"_blank\"\u003eDownload the Report\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":44505450512519,"sku":"31-4564","price":44500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/31-4564_1.png?v=1777556249"},{"product_id":"brazilian-alexandrite-ring-6-67-carats","title":"Brazilian Alexandrite Ring, 6.67 Carats","description":"The 6.67-carat Brazilian alexandrite at the center of this ring possesses the remarkable ability to change color. Unlike their Russian counterparts that change from green to red, those alexandrites that hail from the mines of Brazil display a stunning bluish-green hue under white light and change to a rich, deep purple when viewed under incandescent light. This brilliant-cut example is certified by the Gemological Institute of America as being a natural alexandrite of Brazilian origin. It is beautifully set in platinum with 2.21 total carats of diamonds. \u003cbr\u003e\u003cbr\u003e While the alexandrite was first discovered in the Ural Mountains of Russia in the 1800s, many of the finest examples of these stones have been found in Brazil. For example, the 17.08-carat stone known as the Whitney alexandrite can be found in the Smithsonian Museum of Natural History, having been gifted to the National Gem Collection by Carolyn Wright Whitney. Like the present stone, the Whitney alexandrite changes from bluish-green in daylight and fluorescent light to an intense purple in incandescent light. In terms of both rarity and originality, these Brazilian alexandrites outrank nearly every other gemstone known. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Cert_31-5280.pdf\" target=\"_blank\"\u003eDownload the Certification\u003c\/a\u003e \n","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":43231071010951,"sku":"31-5280","price":685000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/31-5280_1_3836810f-95ec-4e1a-a707-388b7ce2107a.png?v=1758656145"},{"product_id":"chameleon-diamond-necklace-4-41-carats","title":"Chameleon Diamond Necklace, 4.41 Carats","description":"Chameleon diamonds are the rarest and most sought after of the fancy colored diamonds, and they are the only natural colored diamonds with the ability to change color. This stunning heart-shaped brilliant-cut jewel displays a certified fancy grayish yellowish green color when viewed in normal conditions. When the diamond is gently heated or left in darkness, however, the stone temporarily transforms and radiates with a stunning golden yellow hue. \u003cbr\u003e\u003cbr\u003e Classified as a \"classic\" chameleon diamond, this stone exhibits thermochromism and photochromism, meaning its color changes due to both temperature and light conditions. Scientifically, there is no certain cause for this phenomenon, but it is believed to be due, in part, to the reaction between the diamond's hydrogen and isolated nitrogen atoms interacting when \"excited\" by increased temperatures and changes in UV light rays. This fascinating process cannot be duplicated, and there exists no known treatment to cause the chameleon effect in other stones. A true natural wonder, this diamond is one of the few of this size and quality found on the market.  \u003cbr\u003e\u003cbr\u003e This 4.41-carat chameleon diamond is certified by the Gemological Institute of America to be a natural fancy grayish yellowish green chameleon diamond with a VS2 clarity grade. It is set in 18K rose gold amongst 0.24 carat of pink diamonds. \u003cbr\u003e\u003cbr\u003e 16\" length \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Cert_31-5553.pdf\" target=\"_blank\"\u003eDownload the GIA Certification\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":44543562907783,"sku":"31-5553","price":228500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/31-5553_1.png?v=1777556687"},{"product_id":"color-change-brazilian-alexandrite-ring-11-02-carats","title":"Color-Change Brazilian Alexandrite Ring, 11.02 Carats","description":"The 11.02-carat Brazilian alexandrite at the center of this ring possesses the remarkable ability to change color. Unlike their Russian counterparts that change from green to red, those alexandrites that hail from the mines of Brazil display a stunning blue-green hue under white light and change to a rich reddish-purple when viewed under incandescent light. This brilliant-cut example is certified by GemResearch Swisslabs, the American Gemological Laboratories and the Swiss Gemmological Institute as being a natural alexandrite of Brazilian origin with a prominent color change. It is beautifully set in platinum with 1.40 total carats of diamonds. \u003cbr\u003e\u003cbr\u003e While the alexandrite was first discovered in the Ural Mountains of Russia in the 1800s, many of the finest examples of these stones have been found in Brazil. For example, the 17.08-carat stone known as the Whitney alexandrite can be found in the Smithsonian Museum of Natural History, having been gifted to the National Gem Collection by Carolyn Wright Whitney. Like the present stone, the Whitney alexandrite changes from bluish-green in daylight and fluorescent light to an intense purple in incandescent light. In terms of both rarity and originality, these Brazilian alexandrites outrank nearly every other gemstone known. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Cert_31-5284.pdf\" target=\"_blank\"\u003eDownload the Certification\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":43672928419975,"sku":"31-5284","price":985000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/31-5284_1_a558bafb-c4fb-4b25-b3cd-ebe1170ba162.png?v=1767200182"},{"product_id":"color-change-russian-alexandrite-ring-1-31-carats","title":"Color Change Russian Alexandrite Ring, 1.31 Carats","description":"The 1.3-carat alexandrite set in this ring represents one of the rarest varieties of color-changing gemstones. The chameleon-like qualities of the stone stem from the complex way in which it absorbs certain types of light. Viewed in the daylight or under fluorescent light, the alexandrite displays a blue-green hue, while incandescent light changes its color to a rich burgundy. The phenomenon has led many to describe this rare gem as \"an emerald by day, a ruby by night.\" The remarkable alexandrite is accented by diamonds totaling 0.50 carats and set in platinum. \u003cbr\u003e\u003cbr\u003e Apart from its remarkable color-changing abilities, the alexandrite also enjoys an illustrious history. According to legend, it was discovered in 1834 on the day that the future Russian Tsar Alexander II came of age, and thus it was named \"Alexandrite\" in his honor. Because the stone's color shifts from green to red — the national colors of Imperial Russia — the alexandrite also became the country’s official gemstone. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Cert_31-5759.pdf\" target=\"_blank\"\u003eDownload the Certifications\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":43672938872967,"sku":"31-5759","price":78500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/31-5759_1.png?v=1767198673"},{"product_id":"chameleon-diamond-ring-1-73-carats","title":"Chameleon Diamond Ring, 1.73 Carats","description":"Elegant and entrancing, this exquisite ring features a coveted chameleon diamond at the center. The 1.73-carat diamond is certified by the Gemological Institute of America as displaying a fancy grayish-yellowish-green color when viewed in normal conditions. When the diamond is gently heated or left in darkness, however, the stone temporarily transforms and radiates with an exquisite golden hue. The dazzling chameleon diamond is further distinguished for its VVS2 clarity. The center color-changing stone is flanked by two GIA-certified very light pink diamonds totaling 1.10 carats. The three dazzling colored diamonds are accented by pink diamond melée totaling 0.39 carat and set in 18K rose gold. \u003cbr\u003e\u003cbr\u003e Fancy colored diamonds have captured the fascination of the jewelry industry for their beauty, rarity and unique hues. While all fancy colored diamonds are distinguished for their colorful splendor and radiance, chameleon diamonds are the only natural colored diamonds with the ability to change color. A captivating mystery, there is no certain scientific reason for this phenomenon, but it is believed to be due, in part, to the reaction between the diamond's hydrogen and isolated nitrogen atoms interacting when \"excited\" by increased temperatures and changes in UV light rays. This fascinating process cannot be duplicated, and there exists no known treatment to cause the chameleon effect in other stones. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Cert_31-7330.pdf\" target=\"_blank\"\u003eDownload the Certification\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":43874773172359,"sku":"31-7330","price":198500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/31-7330_1.png?v=1772359058"},{"product_id":"color-change-sapphire-ring-4-83-carats","title":"Color-Change Sapphire Ring, 4.83 Carats","description":"Strikingly beautiful and unique, this remarkable color-change sapphire is a coveted rarity. The mesmerizing 4.83-carat gem is certified by the prestigious C. Dunaigre labs as originating in Ceylon and being completely free of any heat treatment. The stunning jewel reflects a violetish-blue hue in daylight and a deeper purple hue in incandescent light. The remarkable natural sapphire is faceted into a beautiful cushion shape. An astounding natural marvel, this color-change sapphire gives the benefit of two gemstones in one. The sapphire is flanked by artfully arranged marquis-shaped diamonds totaling approximately 0.75 carat. Set with platinum. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Cert_31-7726.pdf\" target=\"_blank\"\u003eDownload the Certification\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":43231109578887,"sku":"31-7726","price":60000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/31-7726_1_9d0eea11-34d4-433b-acbc-91771d777fb8.png?v=1758656220"},{"product_id":"brazilian-alexandrite-earrings-9-04-carats","title":"Brazilian Alexandrite Earrings, 9.04 Carats","description":"This remarkable pair of Brazilian alexandrite earrings showcases the spellbinding beauty of the coveted color-changing gems. Two beautiful alexandrites weighing 4.68 and 4.36 carats, respectively, are set in an elegant design amongst a profusion of diamonds totaling 6.12 carats. The alexandrites are accompanied by their AGL and the GIA reports, confirming each is completely untreated and displaying excellent and prominent color change, transforming from deep bluish green to reddish pink. Set in platinum. \u003cbr\u003e\u003cbr\u003e While the alexandrite was first discovered in the Ural Mountains of Russia in the 1800s, many of the finest examples of these stones have been found in Brazil. For example, the 17.08-carat stone known as the Whitney alexandrite can be found in the Smithsonian Museum of Natural History, having been gifted to the National Gem Collection by Carolyn Wright Whitney. Like the present gemstones, the Whitney alexandrite changes from bluish-green in daylight and fluorescent light to an intense purple in incandescent light. A fantastic rarity, the color change exhibited in alexandrites continues to mystify and delight all who encounter these gems. \u003cbr\u003e\u003cbr\u003e 1 1\/2\" length \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Report_31-7526.pdf\" target=\"_blank\"\u003eDownload the Reports\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":44451971924103,"sku":"31-7526","price":985000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/31-7526_1_e064e322-6bfb-42e5-8bfc-9441bb4864c2.png?v=1777555877"},{"product_id":"color-change-brazilian-alexandrite-ring-4-74-carats","title":"Color-Change Brazilian Alexandrite Ring, 4.74 Carats","description":"This incredible 4.74-carat untreated Brazilian alexandrite is a perfect example of the coveted color change phenomena. Unlike their Russian counterparts that change from green to red, alexandrites that hail from the mines of Brazil display a stunning bluish-green hue under white light and change to a rich, deep purple when viewed under incandescent light. This emerald cut example is also graded by the AGL as completely natural, undergoing no treatments to enhance its stunning phenomena. Beautifully set in platinum with two accent diamonds totaling 1.50 carats, this ring is a highly rare treasure. \u003cbr\u003e\u003cbr\u003e While the alexandrite was first discovered in the Ural Mountains of Russia in the 1800s, many of the finest examples of these stones have been found in Brazil. For example, the 17.08-carat stone known as the Whitney alexandrite can be found in the Smithsonian Museum of Natural History, having been gifted to the National Gem Collection by Carolyn Wright Whitney. Like this gemstone, the Whitney alexandrite changes from bluish-green in daylight and fluorescent light to an intense purple in incandescent light. In terms of both rarity and originality, Brazilian alexandrites are in a class all their own. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Report_32-0598.pdf\" target=\"_blank\"\u003eDownload the Report\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":44553399238791,"sku":"32-0598","price":600000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/32-0598_1.png?v=1780341721"},{"product_id":"cartier-color-change-ceylon-alexandrite-ring-6-29-carats-1","title":"Cartier Color-Change Ceylon Alexandrite Ring, 6.29 Carats","description":"This remarkable 6.29-carat untreated Ceylon alexandrite exemplifies the coveted color-change phenomenon in an exceptional setting by Cartier. The cushion cut gem displays a vivid green in natural light, shifting to a rich brownish pink under incandescent light. Graded by the AGL as completely natural and untreated, the phenomenal stone showcases its extraordinary properties without enhancement. The degree of color change is rated prominent to strong, with an impressive 80–90% shift, and a color-change quality graded excellent to very good. The alexandrite is accented by 1.75 carats of diamonds and set in 18K yellow gold by the renowned jeweler Carter. \u003cbr\u003e\u003cbr\u003e Though alexandrite was first discovered in Russia’s Ural Mountains in the 1800s, many of the finest examples have since been sourced from Sri Lanka. This Ceylon alexandrite is particularly rare and highly prized by collectors and designers alike for its exceptional clarity, intensity of color and unique optical properties. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Report_32-1044.pdf\" target=\"_blank\"\u003eDownload the Report\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":42639895593095,"sku":"32-1044","price":360000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/32-1044_1_6aa3a7eb-060e-4f72-a629-22d032a86933.png?v=1747063967"},{"product_id":"ceylon-color-change-sapphire-ring-5-67-carats","title":"Ceylon Color-Change Sapphire Ring, 5.67 Carats","description":"Showcasing the extraordinary versatility of sapphire, this exquisite ring presents a rare square cushion cut Ceylon sapphire totaling 5.67 carats. Displaying a velvety violetish blue hue, the stone’s origin in the prestigious Ceylon region is confirmed by the accompanying AGL report. Additionally, the report verifies that the sapphire displays a change of color when viewed under different lighting conditions, an exceptional and highly sought-after characteristic. Flanking the center stone are two vibrant yellow sapphires totaling 4.60 carats, cut into elegant heart shapes, which add warmth, brilliance and a romantic flourish to the overall design. Set in 18K yellow gold and platinum. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Report_32-1025.pdf\" target=\"_blank\"\u003eDownload the Report\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":42628631036039,"sku":"32-1025","price":60000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/32-1025_1.png?v=1746566814"},{"product_id":"color-change-pyrope-garnet-ring-8-85-carats","title":"Color-Change Pyrope Garnet Ring, 8.85 Carats","description":"This exceptional ring showcases a remarkable 8.85-carat pyrope garnet that exhibits the rare optical phenomenon of color change, shifting from pinkish purple in daylight to purplish pink under incandescent light. The round novelty cut center stone has been graded by the Gemological Institute of America, which confirms its rare color-change properties. Surrounding the mesmerizing garnet is a halo of brilliant white diamonds totaling 1.42 carats, while additional pear-shaped diamonds flanking the center stone enhance the ring's sophisticated design. Set in platinum. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Report_32-1170.pdf\" target=\"_blank\"\u003eDownload the Report\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":43875930374279,"sku":"32-1170","price":98500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/32-1170_1.png?v=1772367304"},{"product_id":"color-change-alexandrite-earrings-2-94-carats","title":"Color-Change Alexandrite Earrings, 2.94 Carats","description":"Few gemstones rival the rarity and mystique of Alexandrite, and this exceptional pair of drop earrings showcases two beautifully matched examples. The oval shaped step cut Alexandrites total 2.94 carats and each displays a dramatic and desirable color change—yellowish green to brown-pink, and bluish green to brownish purple—as confirmed by the accompanying GIA reports. These phenomenal stones are accented by round and hexagonal diamonds totaling 1.28 carats, which form a delicate drop. Set in platinum. \u003cbr\u003e\u003cbr\u003e Elegant in design and noble in origin, these earrings represent one of the world’s most valuable and storied gemstones. According to legend, Alexandrite was first discovered in Russia in 1834 on the birthday of Czar Alexander II. With red and green hues that mirrored the national colors of Imperial Russia, it became the official gemstone of the Russian crown and a favorite of the aristocracy. These remarkable earrings capture that royal legacy in every detail. \u003cbr\u003e\u003cbr\u003e 1 3\/8\" length \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Report_32-1330.pdf\" target=\"_blank\"\u003eDownload the Reports\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":43876112400519,"sku":"32-1330","price":88500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/32-1330_1.png?v=1772377235"},{"product_id":"ceylon-color-change-spinel-ring-15-35-carats","title":"Ceylon Color-Change Spinel Ring, 15.35 Carats","description":"Displaying the extraordinary ability to change color under different light conditions, the Ceylon spinel at the center of this ring is an exceptional rarity in the world of colored gemstones. Color-change spinels weighing over one carat are rarely found, and this phenomenal example totals a monumental 15.35 carats. The oval brilliant cut gem reveals a grayish purple hue when viewed in incandescent light and a stunning grayish blue when viewed in fluorescent light, and it is graded as entirely untreated by the accompanying AGL report. This report also confirms its prestigious Ceylon origin. A halo of diamonds, totaling 0.50 carat and extending down the band, enhances the centerpiece, all set in 18K white gold. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Report_32-1447.pdf\" target=\"_blank\"\u003eDownload the Report\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":43049863053447,"sku":"32-1447","price":120000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/32-1447_1.png?v=1755293111"},{"product_id":"color-change-ceylon-alexandrite-ring-7-94-carats","title":"Color-Change Ceylon Alexandrite Ring, 7.94 Carats","description":"Displaying the famed color-change phenomenon, the extraordinary 7.94-carat Ceylon alexandrite at the center of this ring shifts from a vivid brownish green in fluorescent light to a striking orangy brown in incandescent light. \u003cbr\u003e\u003cbr\u003e Graded by the AGL as entirely free from treatment and originating in the prestigious Ceylon region, the gemstone exemplifies the natural rarity of alexandrite. The oval gemstone is flanked by white diamonds totaling 1.20 carats and set in 18K yellow gold. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Report_32-1496.pdf\" target=\"_blank\"\u003eDownload the Report\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":43231220924551,"sku":"32-1496","price":165000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/32-1496_1_2f311202-5308-4116-b47b-418f281be5d3.png?v=1758656627"},{"product_id":"brazilian-alexandrite-ring-1-24-carats","title":"Brazilian Alexandrite Ring, 1.24 Carats","description":"This elegant ring centers a stunning, untreated Brazilian alexandrite with remarkable depth of color. Weighing 1.24 carats, this rare gem is an exceptional example of the color-change phenomenon that makes alexandrite so coveted. Under white light, the hue is a vibrant bluish-green, which shifts to a deep purple when viewed under incandescent light. Certified by the AGL as completely free of heat treatment, this magnificent alexandrite is an incredible natural wonder. Complemented by 1.16 carats of diamonds and set in platinum. \u003cbr\u003e\u003cbr\u003e While the alexandrite was first discovered in the Ural Mountains of Russia in the 1800s, many of the finest examples of these stones have been found in Brazil. For example, the 17.08-carat stone known as the Whitney alexandrite can be found in the Smithsonian Museum of Natural History, gifted to the National Gem Collection by Carolyn Wright Whitney. Like this gemstone, the Whitney alexandrite changes from bluish-green in daylight and fluorescent light to an intense purple in incandescent light. In terms of both rarity and originality, Brazilian alexandrites are in a class all their own. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Report_32-2389.pdf\" target=\"_blank\"\u003eDownload the Report\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":44589535527047,"sku":"32-2389","price":44500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/32-2389_1.png?v=1778599273"},{"product_id":"alexandrite-ring-untreated-3-24-carats","title":"Alexandrite Ring, Untreated, 3.24 Carats","description":"This elegant ring centers an untreated alexandrite with a stunning depth of color. Weighing 3.24 carats, this remarkable gem is an exceptional example of the color-change phenomenon that makes alexandrite so coveted. Under white light, the hue is a vibrant bluish-green, which shifts to a deep purple when viewed under incandescent light. This rare gem is certified by the AGL as completely free of heat treatment, meaning its remarkable hue is entirely natural. The artful setting features an additional 1.33 carats of round white diamonds in a dramatic floral design. Set in 18K white gold. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Report_32-2396.pdf\" target=\"_blank\"\u003eDownload the Report\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":44719324364935,"sku":"32-2396","price":88500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/32-2396_1.png?v=1781191274"},{"product_id":"cats-eye-alexandrite-ring-4-16-carats","title":"Cat's Eye Alexandrite Ring, 4.16 Carats","description":"This extraordinary ring centers a 4.16-carat cat's-eye alexandrite, among the rarest and most coveted gemstones. Named for the luminous band of light that glides across its surface, resembling a feline pupil, the cat's-eye effect is an exceptionally uncommon phenomenon in alexandrite and requires both remarkable crystal structure and expert cutting to achieve. A specimen of this size is particularly noteworthy. \u003cbr\u003e\u003cbr\u003e Adding to its rarity, the alexandrite displays the gem's celebrated color-change effect, shifting from green in natural daylight to a warm brown-purple hue under incandescent light, as confirmed by its accompanying GIA report. Alexandrites exhibiting both a strong color change and a distinct cat's-eye effect are prized by collectors for their exceptional scarcity and beauty. \u003cbr\u003e\u003cbr\u003e The striking design is completed by a double halo surrounding the center stone, set with 1.37 carats of carefully matched alexandrites and 1.73 carats of white diamonds. Set in platinum, the ring showcases one of nature's most remarkable gemological treasures. \u003cbr\u003e\u003cbr\u003e \u003ca href=\"http:\/\/library.rauantiques.com\/Report_32-2793.pdf\" target=\"_blank\"\u003eDownload the Report\u003c\/a\u003e","brand":"M.S. Rau","offers":[{"title":"Default Title","offer_id":44843838963847,"sku":"32-2793","price":98500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/2471\/0466\/files\/32-2793_1.png?v=1781191388"}],"url":"https:\/\/rauantiques.com\/collections\/3-26-color-change-gemstones.oembed","provider":"M.S. Rau","version":"1.0","type":"link"}