{"title":"GIA Report 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-documented 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-intl\/collections\/color-change-sapphire\"\u003eAll Color-Change Sapphire\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-intl\/collections\/natural-star-sapphires-six-ray-asterism-unheated-ceylon\"\u003eStar Sapphire\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-intl\/collections\/gia-certified-stones\"\u003eAll GIA Report Stones\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-intl\/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-intl\/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-intl\/blogs\/information-pages-complete-guide\/sapphire-buying-guide\"\u003eUltimate Sapphire Buying Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-intl\/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-intl\/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 Color-Change Sapphire – Cushion, Unheated | GIA Sapphire Report 1236949156","description":"\u003cp\u003e2.01 carat cushion color-change sapphire, measuring 7.17 × 5.80 × 4.81 mm, accompanied by GIA Sapphire Report #1236949156 dated 12 May 2026. The report records Color Greenish Blue changing to Purple, Transparency Transparent, Species Natural Corundum, Variety Natural Sapphire, two separate cutting-style fields, and an Additional Results field that reads No Indications of Heating. Its Geographic Origin field reads Not Requested.\u003c\/p\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: 12px; color: #4a235a;\"\u003eExpert Opinion\u003c\/h2\u003e\n\u003cp style=\"font-weight: 600; margin-bottom: 6px;\"\u003e\u003ca href=\"\/en-intl\/pages\/ahmed-shareek-about-the-owner\" style=\"color: #4a235a; text-decoration: underline;\"\u003eAhmed Shareek\u003c\/a\u003e's Assessment\u003c\/p\u003e\n\u003cp style=\"font-style: italic; margin-bottom: 0;\"\u003e\"This one is a 2.01 carat cushion, and it comes with a GIA Sapphire Report whose fields you can read for yourself. Face-up, at normal viewing distance, it looks eye-clean to me; under magnification you can see inclusions, and some show in GIA's report photograph. Ask me for more images and look at it before you decide.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eWhat the Report Records\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\n\u003cp\u003e\u003cstrong\u003eThe limit of our own reporting.\u003c\/strong\u003e We report the fields GIA printed on this document. Where we add a view of our own, such as our sourcing record, the clarity assessment, the setting advice and the cleaning preference, we mark it as ours.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eRead it yourself.\u003c\/strong\u003e The report is reproduced in the images on this page, and GIA's own service at reportcheck.gia.edu returns the same fields against the report number. Check it there, and ask us for anything else you want to see before you buy.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eColor.\u003c\/strong\u003e The Color field reads Greenish Blue changing to Purple. In its Comments section, GIA prints: \"This stone exhibits a change of color when viewed under daylight or fluorescent vs incandescent light.\"\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhich light gives which color.\u003c\/strong\u003e The report names two colors and two kinds of light, but it does not say which color belongs to which light. Our own reading pairs them in order: greenish blue in daylight or fluorescent light, purple in incandescent light. We call this stone a color-change sapphire because the Color field and the Comment both record a change of color.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe report photograph.\u003c\/strong\u003e It shows this one stone twice, under two different lights. GIA prints beneath it: \"Image is not to scale. Color is approximate.\"\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eGeographic origin.\u003c\/strong\u003e The Geographic Origin field reads Not Requested: an origin opinion was not requested from GIA for this report.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAdditional Results.\u003c\/strong\u003e The field reads No Indications of Heating. That is a finding about heat, and it is what we mean when we call this stone unheated.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCutting style, two fields.\u003c\/strong\u003e The report gives the crown and the pavilion separately: Crown: Brilliant Cut, and Pavilion: Modified Step Cut. The crown carries brilliant-style faceting; the pavilion carries step-style faceting in a modified form.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eClarity.\u003c\/strong\u003e Face-up, at normal viewing distance, we describe it as eye-clean. Under magnification inclusions are visible, and some can be seen in GIA's report photograph. That is our own assessment rather than a report value, because a GIA colored-stone report carries no clarity grade.\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eOur Sourcing Record\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThis stone was mined in Madagascar and bought by us in Sri Lanka. That record is ours, not a laboratory finding.\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eBuying Guidance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cp\u003eA few practical points to weigh before purchasing this specific stone:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRead GIA Report #1236949156 against the stone.\u003c\/strong\u003e Check the report number, the carat weight, the measurements, the color, the transparency, both cutting-style fields, the Additional Results entry and the Comments against the physical stone before you finalize the purchase.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLook at the whole face-up view, in more than one light.\u003c\/strong\u003e Ask us for more images and video, including views in daylight-type and incandescent light, and look at the whole face before you decide.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlan the setting around the stone's proportions.\u003c\/strong\u003e It is sold loose, for your own jeweler to set. A cushion outline has rounded corners. We would choose a setting that holds the girdle securely; that is our own recommendation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eSpecies Characteristics\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThe three values below describe corundum as a mineral species. They are not findings about this individual stone. GIA prints them in the Characteristics panel of this report.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMineral: Corundum\u003c\/li\u003e\n\u003cli\u003eMohs hardness: 9\u003c\/li\u003e\n\u003cli\u003eToughness: Excellent\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eSeparately, this report prints September as the birthstone month. September belongs to sapphire, the variety, in every color.\u003c\/p\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;\"\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;\"\u003eMeasurements\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;\"\u003eShape\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eCushion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eCutting Style (Crown)\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eBrilliant Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eCutting Style (Pavilion)\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eModified Step Cut\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\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eGreenish Blue changing 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;\"\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;\"\u003eSpecies\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eNatural 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;\"\u003eVariety\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eNatural Sapphire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eGeographic Origin\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eNot Requested\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eAdditional Results\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eNo Indications of Heating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee; font-weight: 600;\"\u003eComments\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003e\"This stone exhibits a change of color when viewed under daylight or fluorescent vs incandescent light.\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 8px; font-weight: 600;\"\u003eLaboratory Report\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\u003eMeasurements: 7.17 × 5.80 × 4.81 mm\u003c\/li\u003e\n\u003cli\u003eShape: Cushion\u003c\/li\u003e\n\u003cli\u003eCutting Style, crown: Brilliant Cut\u003c\/li\u003e\n\u003cli\u003eCutting Style, pavilion: Modified Step Cut\u003c\/li\u003e\n\u003cli\u003eColor: Greenish Blue changing to Purple\u003c\/li\u003e\n\u003cli\u003eTransparency: Transparent\u003c\/li\u003e\n\u003cli\u003eSpecies: Natural Corundum\u003c\/li\u003e\n\u003cli\u003eVariety: Natural Sapphire\u003c\/li\u003e\n\u003cli\u003eGeographic Origin: Not Requested\u003c\/li\u003e\n\u003cli\u003eAdditional Results: No Indications of Heating\u003c\/li\u003e\n\u003cli\u003eComments: \"This stone exhibits a change of color when viewed under daylight or fluorescent vs incandescent light.\"\u003c\/li\u003e\n\u003cli\u003eLaboratory Report: GIA Report #1236949156\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e\u003cstrong\u003eCare\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eGIA publishes its own cleaning guidance for sapphire. We prefer warm soapy water and a soft brush to ultrasonic or steam cleaners, because we cannot see how a stone is held once it is set. That preference is ours, not a condition carried on the report.\u003c\/p\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\u003eOnce it is set, take it off for heavy physical work\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e\u003cstrong\u003eThis Stone\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThis is one individual natural gemstone, not laboratory-grown material. The stone you receive is the stone documented on GIA Report #1236949156.\u003c\/p\u003e\n\n\u003ch2\u003e\u003cstrong\u003eWhat's included with this 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-intl\/collections\/gia-certified-color-change-sapphires.oembed","provider":"Crescent Gems","version":"1.0","type":"link"}