{"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-om\/collections\/color-change-sapphire\"\u003eAll Color-Change Sapphire\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-om\/collections\/natural-star-sapphires-six-ray-asterism-unheated-ceylon\"\u003eStar Sapphire\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-om\/collections\/gia-certified-stones\"\u003eAll GIA Report Stones\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-om\/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-om\/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-om\/blogs\/information-pages-complete-guide\/sapphire-buying-guide\"\u003eUltimate Sapphire Buying Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-om\/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-om\/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\u003eA natural 2.01 ct \u003cstrong\u003ecolour-change sapphire\u003c\/strong\u003e, Cushion, \u003cstrong\u003eunheated\u003c\/strong\u003e, measuring 7.17 × 5.80 × 4.81 mm, on \u003cstrong\u003eGIA Sapphire Report #1236949156\u003c\/strong\u003e (12 May 2026). GIA records the colour as \u003cstrong\u003eGreenish Blue changing to Purple\u003c\/strong\u003e, and Additional Results \u003cstrong\u003eNo Indications of Heating\u003c\/strong\u003e. Its Geographic Origin reads Not Requested.\u003c\/p\u003e\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-om\/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\u003ch2\u003eGood to Know\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify it:\u003c\/strong\u003e run report #1236949156 through GIA’s Report Check before buying.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe colour change is GIA’s recorded field\u003c\/strong\u003e (Greenish Blue changing to Purple) — see it shift between daylight and warm indoor light.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnheated covers heating only;\u003c\/strong\u003e origin was not requested, so GIA names no country.\u003c\/li\u003e\n\u003cli\u003eSee it shift for yourself via \u003cstrong\u003eTry Before You Buy\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCare \u0026amp; What’s Included\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eClean with warm water, mild soap and a soft brush; store separately; avoid ultrasonic and steam cleaners.\u003c\/li\u003e\n\u003cli\u003eShips with GIA Sapphire Report #1236949156, 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-om\/collections\/gia-certified-color-change-sapphires.oembed","provider":"Crescent Gems","version":"1.0","type":"link"}