{"title":"GIA Certified Color-Change Sapphires - Lab-Verified Natural Stones","description":"\u003cp\u003eColor-change sapphire is one of nature's rarer tricks: a stone that shifts hue depending on the light source, typically reading blue-violet to purplish-grey under daylight or fluorescent light and shifting toward purple-red under incandescent light. This collection narrows that already-scarce category down to the stones with independent backing — every piece here ships with a GIA identification or origin report confirming what you're seeing is genuine and natural.\u003c\/p\u003e\n\n\u003ch2\u003eWhy GIA-certified color-change\u003c\/h2\u003e\n\n\u003cp\u003eColor-change is caused by trace vanadium and chromium interacting differently with different light spectra, and it's rare enough that misidentification (or confusion with simpler color-zoned stones) is common in the trade. A GIA report confirms the stone is natural corundum showing genuine color-change behavior, states whether it has been heat-treated, and for many pieces offers an origin opinion.\u003c\/p\u003e\n\n\u003ch2\u003eWhat to expect\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe color shift.\u003c\/strong\u003e Look for a clear, distinct shift between light sources rather than a subtle tonal difference — the more dramatic and consistent the change, the more desirable the stone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eTreatment.\u003c\/strong\u003e Color-change sapphires in this collection are predominantly unheated, as treatment can affect the phenomenon; treatment status is confirmed on the GIA report and stated on every product page.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCertification.\u003c\/strong\u003e Every stone here carries a GIA report; the issuing lab and report number are noted on the product page.\u003c\/p\u003e\n\n\u003ch2\u003eShop more phenomenal sapphire\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-gcc\/collections\/color-change-sapphire\"\u003eAll Color-Change Sapphire\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-gcc\/collections\/natural-star-sapphires-six-ray-asterism-unheated-ceylon\"\u003eStar Sapphire\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-gcc\/collections\/gia-certified-stones\"\u003eAll GIA Certified Stones\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-gcc\/collections\/all-sapphire-gemstones\"\u003eAll Sapphire (every color)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eLearn more\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-gcc\/blogs\/information-pages-complete-guide\/what-is-a-gia-sapphire-report-and-how-do-you-read-one\"\u003eHow to Read a GIA Sapphire Report\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-gcc\/blogs\/information-pages-complete-guide\/sapphire-buying-guide\"\u003eUltimate Sapphire Buying Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-gcc\/blogs\/information-pages-complete-guide\/what-is-an-unheated-sapphire\"\u003eWhat Is an Unheated Sapphire?\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eHave a question about a specific report or want help choosing? Email \u003ca href=\"mailto:crescentgems@gmail.com\"\u003ecrescentgems@gmail.com\u003c\/a\u003e — we respond personally within one business day. Every loose stone qualifies for our 14-day return policy. Select pieces are available through our \u003ca href=\"\/en-gcc\/collections\/try-before-you-buy-loose-gemstone\"\u003eTry-On program\u003c\/a\u003e. Free US shipping on every order.\u003c\/p\u003e\n","products":[{"product_id":"2-01-ct-color-change-sapphire-unheated-gia","title":"2.01 ct Natural Unheated Color-Change Sapphire – Cushion Cut | GIA Certified","description":"\u003cp\u003e2.01 carat rectangular cushion-cut color-change sapphire, natural and completely unheated, measuring 7.17 × 5.80 × 4.81 mm. The stone shifts from a saturated greenish-blue under daylight and fluorescent light to a clear purple under incandescent light — a well-defined two-color response that qualifies as a true color-change phenomenon. The shift is immediately visible when moving the stone between light sources. No heat treatment or any other enhancement of any kind; the color change is the stone's own natural property. Accompanied by GIA Report #1236949156 confirming natural origin, weight, dimensions, and unheated status.\u003c\/p\u003e\n\u003cdiv style=\"border: 2px solid #5b2c6f; border-radius: 10px; padding: 20px 24px; margin: 28px 0; background-color: #f9f5fc;\"\u003e\n\u003ch2 style=\"color: #4a235a; margin-top: 0;\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eExpert Opinion\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\"What makes this stone worth stopping for is the phenomenon itself,\" says Ahmed Shareek, gemologist at Crescent Gems. \"This is a true, well-defined color-change sapphire — a saturated greenish-blue in daylight or fluorescent light that shifts to a clear purple under incandescent light. That's not a subtle drift in tone; it's two distinct colors in one stone, and it's completely natural and unheated. Genuine color-change corundum with this strong a response is something you don't come across often.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eRarity Analysis\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue color-change phenomenon:\u003c\/strong\u003e Genuine color-change sapphire is rare in the gem market. The specific trace-element combination — typically vanadium — that produces a strong, well-defined two-color response in corundum under different light sources is uncommon; it's a much less frequent occurrence than the color-change effects seen in garnet or the classic alexandrite response in chrysoberyl.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrength and clarity of the shift:\u003c\/strong\u003e This stone shows a well-defined two-color response, not a partial or muddy transition. A clean, unambiguous shift between greenish-blue and purple is itself a quality and rarity marker — many color-change stones on the market show only a faint or inconsistent shift.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnheated and untreated:\u003c\/strong\u003e This sapphire has never been heated. Heat treatment can damage or alter the trace-element structure responsible for color change, so natural material that displays this phenomenon without any enhancement is especially valued.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e Graded Very Slightly Included — an honest, eye-clean grade rather than a flawless one. We note this plainly rather than overselling it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndependent documentation:\u003c\/strong\u003e Accompanied by GIA Report #1236949156, confirming natural origin, weight, dimensions, and unheated status from an independent laboratory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCombined effect:\u003c\/strong\u003e A genuine, strongly defined color-change phenomenon in an unheated natural sapphire, backed by GIA documentation, places this stone in a distinctly small category of gemstones — most sapphires show no color-change effect at all, and those that do rarely display it this clearly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eBuying Guidance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eView the stone under both daylight (or fluorescent) light and incandescent light before buying. The entire value of this gem lies in the shift itself, so confirm you like both the greenish-blue daylight color and the purple incandescent color — not just one of the two.\u003c\/li\u003e\n\u003cli\u003eVerify unheated, natural color-change status through an independent lab report rather than taking a listing's word for it. Color-change effects can sometimes be imitated, induced, or enhanced in lesser stones, so third-party confirmation matters here more than with a single-color sapphire.\u003c\/li\u003e\n\u003cli\u003eKeep in mind the origin listed, Madagascar, is seller-stated rather than explicitly confirmed on the GIA report, which documents natural origin, weight, dimensions, and unheated status but does not certify country of origin.\u003c\/li\u003e\n\u003cli\u003eJudge clarity honestly: Very Slightly Included means eye-clean beauty, not a flawless stone, and that distinction should factor into your expectations at this price point.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTry Before You Buy:\u003c\/strong\u003e Because this stone's entire appeal rests on the light-to-light transformation, we recommend examining it in person or under multiple lighting setups whenever possible, so you can be certain both color states work for you before committing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eLearn More About This Gemstone\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/crescentgems.com\/blogs\/information-pages-complete-guide\/color-change-sapphire-guide\"\u003eColor-Change Sapphire Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/crescentgems.com\/blogs\/information-pages-complete-guide\/what-is-a-gia-sapphire-report-and-how-do-you-read-one\"\u003eWhat Is a GIA Sapphire Report and How Do You Read One?\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/crescentgems.com\/blogs\/information-pages-complete-guide\/how-to-commission-custom-sapphire-ring\"\u003eCustom Sapphire Rings — The Complete Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/crescentgems.com\/blogs\/information-pages-complete-guide\/sapphire-buying-guide\"\u003eThe Ultimate Guide to Buying Natural Loose Sapphires\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/crescentgems.com\/blogs\/information-pages-complete-guide\/what-is-an-unheated-sapphire\"\u003eWhat Is an Unheated Sapphire? The Complete Buyer's Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/crescentgems.com\/blogs\/information-pages-complete-guide\/madagascar-sapphire-guide\"\u003eMadagascar Sapphire — The Modern Origin That Rivals Ceylon\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/crescentgems.com\/blogs\/information-pages-complete-guide\/cushion-cut-sapphire-guide\"\u003eCushion Cut Sapphire — The Complete Guide to the Vintage Shape That Deepens Color\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"border: 2px solid #5b2c6f; border-radius: 10px; padding: 20px 24px; margin: 28px 0; background-color: #f9f5fc;\"\u003e\n\u003ch2 style=\"margin-top: 0; margin-bottom: 14px; color: #4a235a;\"\u003eGemstone Data — At a Glance\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 0.95em;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600; width: 42%;\"\u003eItem #\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eCG8355\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eCarat Weight\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003e2.01 ct\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eSpecies \/ Variety\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eNatural Color-Change Sapphire (Corundum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eShape \/ Cut\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eRectangular Cushion, Mixed Brilliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eDimensions\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003e7.17 × 5.80 × 4.81 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eColor \/ Intensity\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eSaturated greenish-blue (daylight\/fluorescent) to purple (incandescent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003ePhenomenon\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eTrue color-change (greenish-blue to purple)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eTreatment\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eNone — unheated and untreated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eOrigin\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eMadagascar — seller-stated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eClarity\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eVery Slightly Included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eTransparency\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eTransparent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eHardness\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003e9 (Mohs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; font-weight: 600;\"\u003eCertification\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px;\"\u003eGIA Report #1236949156\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eSKU: CG8355\u003c\/li\u003e\n\u003cli\u003eCarat Weight: 2.01 carats\u003c\/li\u003e\n\u003cli\u003eVariety: Color-Change Sapphire\u003c\/li\u003e\n\u003cli\u003eShape: Rectangular Cushion\u003c\/li\u003e\n\u003cli\u003eCutting Style: Mixed Brilliant (brilliant crown, modified step cut pavilion)\u003c\/li\u003e\n\u003cli\u003eDimensions: 7.17 × 5.80 × 4.81 mm\u003c\/li\u003e\n\u003cli\u003eGem Type: Natural Color-Change Sapphire\u003c\/li\u003e\n\u003cli\u003eOrigin: Madagascar\u003c\/li\u003e\n\u003cli\u003eTreatment: None — unheated and untreated (no indications of heating)\u003c\/li\u003e\n\u003cli\u003eColor: Greenish-blue (daylight \/ fluorescent) to purple (incandescent)\u003c\/li\u003e\n\u003cli\u003eTransparency: Transparent\u003c\/li\u003e\n\u003cli\u003eClarity: Very Slightly Included\u003c\/li\u003e\n\u003cli\u003eCertification: GIA Report #1236949156\u003c\/li\u003e\n\u003cli\u003eHardness: 9 on the Mohs scale\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e\u003cstrong\u003eCare\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eClean with lukewarm water and mild soap using a soft brush\u003c\/li\u003e\n\u003cli\u003eStore separately to avoid surface contact\u003c\/li\u003e\n\u003cli\u003eRemove before heavy physical activity\u003c\/li\u003e\n\u003cli\u003eAvoid ultrasonic or steam cleaners\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e\u003cstrong\u003eOne of a Kind\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThis is a single natural gemstone, not a manufactured or lab-created replica — no two sapphires form with identical color, inclusions, and internal character, and true color-change stones like this one are especially uncommon. Once this stone sells, it's gone; there is no duplicate. What you see documented on the GIA report is the exact, individual stone you receive.\u003c\/p\u003e\n\n\u003ch2\u003e\u003cstrong\u003eWhat’s included with this Color-Change Sapphire\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eGIA Report #1236949156\u003c\/li\u003e\n\u003cli\u003eGemstone packed in a gem sleeve\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Crescent Gems","offers":[{"title":"Default Title","offer_id":42798903623747,"sku":"CG8355","price":2211.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/8982\/8931\/files\/1112023001_96c376e1-d3a5-470f-affd-600dfa3a10c7.jpg?v=1778308039"}],"url":"https:\/\/crescentgems.com\/en-gcc\/collections\/gia-certified-color-change-sapphires.oembed","provider":"Crescent Gems","version":"1.0","type":"link"}