{"product_id":"natural-bi-colour-sapphire-3-70ct-round-cut-loose-gemstone","title":"Natural Bi Colour Sapphire 3.70 Ct Round Cut Loose Gemstone | Blue Yellow Heat Treated September Birthstone","description":"\u003carticle\u003e\n\n\u003cp\u003e\u003cstrong\u003eNatural bi colour sapphire weighing 3.70 carats, featuring a round cut, blue and yellow colour zoning, SI clarity and heat treatment. Offered as a loose gemstone for custom engagement rings, pendants and bespoke jewellery designs, with certification from an authorised gemmologist.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis natural bi colour sapphire displays a striking combination of blue and yellow within a single gemstone. Weighing 3.70 carats and cut in a classic round shape, it is supplied as a loose sapphire, allowing complete flexibility for custom jewellery designs including engagement rings, pendants and statement pieces.\u003c\/p\u003e\n\n\u003cdiv class=\"ai-search-summary\" style=\"background:#f0f6ff;padding:16px;border-radius:8px;margin-bottom:20px;\"\u003e\n\n\u003ch3 style=\"margin-top:0;\"\u003eQuick Summary\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eNatural bi colour sapphire\u003c\/li\u003e\n\u003cli\u003eWeight: 3.70 carats\u003c\/li\u003e\n\u003cli\u003eRound cut loose gemstone\u003c\/li\u003e\n\u003cli\u003eColour: Blue and Yellow\u003c\/li\u003e\n\u003cli\u003eClarity: SI\u003c\/li\u003e\n\u003cli\u003eTreatment: Heat Treated\u003c\/li\u003e\n\u003cli\u003eBirthstone: September\u003c\/li\u003e\n\u003cli\u003eCertificate from an authorised gemmologist included\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\n\u003cp\u003eThe round cut enhances brilliance and symmetry while showcasing the natural contrast between the blue and yellow colour zones. Bi colour sapphires are appreciated for their distinctive appearance, with each gemstone displaying its own individual colour distribution.\u003c\/p\u003e\n\n\u003cp\u003eSapphire belongs to the corundum family and ranks 9 on the Mohs hardness scale, making it suitable for jewellery intended for regular wear when professionally set. As the birthstone for September, sapphire has traditionally been associated with wisdom, loyalty and sincerity.\u003c\/p\u003e\n\n\u003ch2\u003eGemstone Specifications\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdentification:\u003c\/strong\u003e Natural Sapphire\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecies:\u003c\/strong\u003e Natural Corundum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariety:\u003c\/strong\u003e Bi Colour Sapphire\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape \u0026amp; Cut:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e SI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 3.70 Carats\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour:\u003c\/strong\u003e Blue Yellow Bi Colour\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasurements:\u003c\/strong\u003e 9.00 × 5.20 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Heat Treated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBirthstone:\u003c\/strong\u003e September\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCertification \u0026amp; Authenticity\u003c\/h2\u003e\n\n\u003cp\u003eThis sapphire includes a certificate issued by an authorised gemmologist confirming its natural identity and disclosed treatment.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSeller Notes:\u003c\/strong\u003e Crystal and mineral inclusions are present. These internal characteristics are commonly found in natural sapphires and are consistent with natural gemstone formation.\u003c\/p\u003e\n\n\u003cp\u003eSlight colour variation may be visible under different lighting conditions due to the natural colour composition of the gemstone.\u003c\/p\u003e\n\n\u003ch2\u003eJewellery Applications\u003c\/h2\u003e\n\n\u003cp\u003eThis listing is for a loose gemstone only and does not include a finished ring or jewellery setting.\u003c\/p\u003e\n\n\u003cp\u003eSuitable applications include:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eCustom engagement rings\u003c\/li\u003e\n\u003cli\u003eStatement rings\u003c\/li\u003e\n\u003cli\u003ePendants\u003c\/li\u003e\n\u003cli\u003eCustom fine jewellery\u003c\/li\u003e\n\u003cli\u003ePersonalised jewellery projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCustom jewellery services are available in yellow gold, white gold, rose gold, silver and platinum with optional diamond accents.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose a Bi Colour Sapphire?\u003c\/h2\u003e\n\n\u003cp\u003eBi colour sapphires naturally display two colours within a single crystal, giving every gemstone a distinctive appearance. Their unique colour zoning makes them a popular choice for buyers seeking an alternative to traditional single-colour sapphires while maintaining the durability and timeless appeal associated with natural sapphire.\u003c\/p\u003e\n\n\u003ch2\u003eExplore Related Collections\u003c\/h2\u003e\n\n\u003cp\u003eBrowse related collections and educational resources:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/blue-green-teal-sapphire?page=3\"\u003eBi Colour, Teal \u0026amp; Blue Green Sapphire Collection\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/\"\u003eAll Loose Sapphire Gemstones\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/gemstone-articles?page=3\"\u003eGemstone Education Articles\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eShipping \u0026amp; Returns\u003c\/h2\u003e\n\n\u003cp\u003eWorldwide shipping is available with tracking and insurance included. Delivery times generally range from 7–12 business days depending on destination. Buyers are responsible for any applicable customs duties or import taxes.\u003c\/p\u003e\n\n\u003cp\u003eReturns are accepted according to our published return policy, provided the gemstone is returned in its original condition within the applicable return period.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eIs this a natural bi colour sapphire?\u003c\/h3\u003e\n\n\u003cp\u003eYes. This gemstone is a natural bi colour sapphire belonging to the corundum family.\u003c\/p\u003e\n\n\u003ch3\u003eHas this sapphire been treated?\u003c\/h3\u003e\n\n\u003cp\u003eYes. This sapphire has undergone heat treatment, which is disclosed in the specifications and gemmological certificate.\u003c\/p\u003e\n\n\u003ch3\u003eIs this sold as a finished ring?\u003c\/h3\u003e\n\n\u003cp\u003eNo. This listing is for a loose gemstone only. Custom jewellery settings are available separately.\u003c\/p\u003e\n\n\u003ch3\u003eCan this sapphire be used for an engagement ring?\u003c\/h3\u003e\n\n\u003cp\u003eYes. Its durability, round cut and size make it suitable for custom engagement ring designs.\u003c\/p\u003e\n\n\u003ch3\u003eWhy do bi colour sapphires display two colours?\u003c\/h3\u003e\n\n\u003cp\u003eBi colour sapphires naturally develop multiple colours during crystal growth, creating distinctive colour zoning that makes each gemstone unique.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Information\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eAll gemstones offered are natural and earth-mined.\u003c\/li\u003e\n\u003cli\u003eAny treatment applied is disclosed within the product specifications.\u003c\/li\u003e\n\u003cli\u003eNatural gemstones may contain inclusions such as feathers, crystals, needles or colour zoning, which are normal characteristics of natural formation.\u003c\/li\u003e\n\u003cli\u003ePhotographs are provided to represent the gemstone from multiple angles, although colour may vary slightly under different lighting conditions.\u003c\/li\u003e\n\u003cli\u003ePlease contact us if you require additional photographs or assistance with a custom jewellery design.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/article\u003e\n","brand":"NASHGEMS","offers":[{"title":"Default Title","offer_id":48776428749028,"sku":"3.70 crt tl Rmlt 12","price":1050.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/9569\/9940\/files\/BicoloursapphireloosestoneRoundcut3.70crt-2.jpg?v=1776522457","url":"https:\/\/www.nashgems.com\/products\/natural-bi-colour-sapphire-3-70ct-round-cut-loose-gemstone","provider":"NASHGEMS","version":"1.0","type":"link"}