{"product_id":"4-99-ct-oval-affordable-blue-sapphire-gia","title":"4.99 ct Natural Heated Bi-Color Sapphire – Oval Cut | GIA Certified | Madagascar","description":"\u003cp\u003eA natural 4.99 carat bi-color blue sapphire in an oval shape with Mixed Cut faceting (Modified Brilliant crown, Step Cut pavilion), from Madagascar, heat-treated and certified by GIA, Report #6237646036. Bi-color sapphire shows two distinct color zones within a single crystal — in this stone, the blue and secondary color zones are visible across different portions of the face-up stone, creating an unusual visual character not present in single-color material. At nearly 5 carats with GIA documentation and Madagascar origin confirmed, this is a substantial and well-specified collector piece.\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=\"https:\/\/crescentgems.com\/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\"Genuine bi-color sapphires — two distinct color zones grown naturally within a single crystal — cross my bench only a handful of times a year, and finding one at nearly 5 carats with GIA-confirmed Madagascar origin made this stone worth setting aside the moment it arrived.\"\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\u003cp\u003eBi-color sapphire occupies a genuinely small slice of overall sapphire production — most crystals grow with one dominant, uniform body color, and material showing two clearly separated color zones within a single stone is a distinct minority of what reaches the cutting wheel.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBi-Color Phenomenon:\u003c\/strong\u003e Most sapphire on the market is single-color; parti-color\/bi-color material like this one — where two zones appear within the same crystal — is uncommon, and rarer still in a size large enough to show both zones clearly face-up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Blue is the most requested sapphire body color, but the secondary zone visible in this stone (documented on the GIA report as color banding through the middle of the stone) is what sets it apart from a conventional single-color blue sapphire.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e At 4.99 carats, this stone is well above the size at which most bi-color sapphire is typically cut — a lot of zoned material is small enough that the effect is difficult to see at all.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e This stone is heat-treated, the standard and widely accepted enhancement used for the large majority of fine sapphire sold today. Treatment status alone doesn't make a stone rare — but it confirms the zoning is a permanent feature of the crystal's growth, not an artifact of processing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocumentation:\u003c\/strong\u003e GIA's report independently confirms carat weight, dimensions, Madagascar origin, and heat treatment — third-party verification of bi-color character alongside origin and treatment is not something every seller can offer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCombined effect:\u003c\/strong\u003e No single factor here is extraordinary in isolation — heat treatment is common, Madagascar is an established origin, and 4.99 ct is substantial but not unheard of. It's the combination of visible bi-color zoning, size sufficient to display it clearly, documented Madagascar origin, and independent GIA certification together that makes this stone difficult to replace with an equivalent.\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\u003cp\u003eA few practical points to weigh before purchasing this specific stone:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZoning looks different depending on orientation.\u003c\/strong\u003e How the two color zones balance face-up can shift with the stone's rotation in a mounting and the angle it's viewed from — use video or an in-hand viewing rather than judging from a single static photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify the GIA report's color description against photos\/video.\u003c\/strong\u003e Bi-color character can be described differently stone to stone; cross-checking Report #6237646036 against what you see is worth the extra minute before you buy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsider mounting carefully.\u003c\/strong\u003e A setting that keeps the pavilion open (bezel or four-prong) will show the 10.68 x 7.87 x 6.98 mm oval's zoning more clearly than a setting that covers more of the stone's profile — discuss placement with your jeweler if you want a particular zone emphasized face-up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is a heated stone, not an unheated one.\u003c\/strong\u003e Heat treatment here is standard, stable, and permanent — it does not need to be disclosed as a defect — but if an unheated stone specifically matters to you, this is not that stone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse the Try Before You Buy option\u003c\/strong\u003e if you would like to see the stone in hand before finalizing the purchase.\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\/sapphire-colors-explained\"\u003eSapphire Colors Explained\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/crescentgems.com\/blogs\/information-pages-complete-guide\/how-sapphire-heat-treatment-works\"\u003eHow Sapphire Heat Treatment Works\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/crescentgems.com\/pages\/heated-vs-unheated\"\u003eHeated vs Unheated Sapphire\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\"\u003eGIA Guide\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 Ring 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 Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/crescentgems.com\/blogs\/information-pages-complete-guide\/oval-sapphire-guide\"\u003eOval Sapphire Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/crescentgems.com\/blogs\/information-pages-complete-guide\/sapphire-buying-guide\"\u003eSapphire Buying Guide\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;\"\u003eCG8259\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;\"\u003e4.99 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;\"\u003eCorundum \/ Bi-Color 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;\"\u003eShape \/ Cut\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 8px; border-bottom: 1px solid #e5d9ee;\"\u003eOval, Mixed Cut (Modified Brilliant crown, Step Cut pavilion)\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;\"\u003e10.68 x 7.87 x 6.98 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;\"\u003eBlue with secondary color zone (bi-color; Medium intensity; GIA-documented color band through the middle of the stone)\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;\"\u003eBi-Color Zoning (two distinct color zones within a single crystal)\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;\"\u003eHeat Treated\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 (GIA confirmed)\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;\"\u003eEye Clean\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 #6237646036\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eWhy Choose this 4.99 ct Bi-Color Blue Sapphire?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cp\u003eBi-color sapphire is a natural phenomenon — not a treatment, not an enhancement, but a characteristic of how the crystal grew in the earth, with different trace element concentrations in different zones producing visually distinct colors. At 4.99 carats with GIA documentation (Report #6237646036), this stone offers the unusual visual character of bi-color material at a size large enough to display both zones clearly in any setting or mounting.\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eKey Benefits of this Natural Bi-Color Sapphire\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGIA-Documented Madagascar Origin\u003c\/strong\u003e\u003cbr\u003eIndependent confirmation of origin, weight, dimensions, and the bi-color character of the stone (Report #6237646036).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural Bi-Color Phenomenon\u003c\/strong\u003e\u003cbr\u003eTwo color zones within a single crystal — a natural growth characteristic, not a treatment effect.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubstantial 5-Carat Size\u003c\/strong\u003e\u003cbr\u003eLarge enough to display both color zones clearly in any setting or mounting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollector Character\u003c\/strong\u003e\u003cbr\u003eBi-color sapphires attract buyers who want visual distinction over conventional single-color stones.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable for Daily Wear\u003c\/strong\u003e\u003cbr\u003eCorundum at Mohs 9, second only to diamond.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eCarat Weight: 4.99 Carats\u003c\/li\u003e\n\u003cli\u003eGem Type: Natural Bi-Color Sapphire\u003c\/li\u003e\n\u003cli\u003eVariety: Sapphire\u003c\/li\u003e\n\u003cli\u003eShape: Oval\u003c\/li\u003e\n\u003cli\u003eCut Style: Mixed Cut (Modified Brilliant crown, Step Cut pavilion)\u003c\/li\u003e\n\u003cli\u003eDimensions: 10.68 x 7.87 x 6.98 mm\u003c\/li\u003e\n\u003cli\u003eOrigin: Madagascar — GIA confirmed\u003c\/li\u003e\n\u003cli\u003eTreatment: Heat Treated\u003c\/li\u003e\n\u003cli\u003eColor: Blue with secondary color zones (bi-color)\u003c\/li\u003e\n\u003cli\u003eClarity: Eye-clean — no visible inclusions under normal viewing\u003c\/li\u003e\n\u003cli\u003eHardness: 9 on the Mohs scale\u003c\/li\u003e\n\u003cli\u003eCertification: GIA Report #6237646036\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThis 4.99 ct bi-color blue sapphire has been hand-selected for the visual character of its color zoning and the quality of its cutting — the factor that most determines how the two color zones present face-up.\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eOne of a Kind\u003c\/strong\u003e\u003c\/span\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, clarity, and internal character. 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\u003cspan role=\"text\"\u003e\u003cstrong\u003eCare\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cp\u003eSapphire is exceptionally durable (Mohs 9), but a few habits keep it looking its best. Clean with warm water, mild soap, and a soft brush; avoid ultrasonic or steam cleaners if the stone is set alongside softer or treatment-sensitive materials. Store separately from other jewelry to prevent surface scratches to softer pieces, and remove the stone before swimming, exercising, or household chemical exposure. Heat treatment is stable and permanent under normal wear conditions.\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eWhy Customers Love This Gemstone\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGIA Documentation:\u003c\/strong\u003e Origin and quality confirmed by independent lab (Report #6237646036).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual Distinction:\u003c\/strong\u003e Bi-color character creates a look no single-color stone can replicate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubstantial Size:\u003c\/strong\u003e Nearly 5 carats — both color zones fully visible at wearing distance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrusted Source:\u003c\/strong\u003e Madagascar origin documented, treatment disclosed honestly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eOwning this 4.99 ct bi-color blue sapphire means choosing a stone with an inherently distinctive character — a natural growth phenomenon confirmed by GIA.\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003ePerfect Uses for this 4.99 ct Bi-Color Sapphire\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eCollector centerpiece or display stone\u003c\/li\u003e\n\u003cli\u003eStatement pendant\u003c\/li\u003e\n\u003cli\u003eBespoke large-format ring commission\u003c\/li\u003e\n\u003cli\u003eInvestment in documented unusual sapphire material\u003c\/li\u003e\n\u003cli\u003eConversation piece for fine jewelry enthusiasts\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Crescent Gems","offers":[{"title":"Default Title","offer_id":42665947562051,"sku":"CG8259","price":16851.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/8982\/8931\/files\/stone_CG8259_image-1.jpg?v=1778307988","url":"https:\/\/crescentgems.com\/en-ca\/products\/4-99-ct-oval-affordable-blue-sapphire-gia","provider":"Crescent Gems","version":"1.0","type":"link"}