{"product_id":"20-175ct-purple-green-colour-change-corundum-alexandrite-pixel-cut-13x18-mm-gemdrop®-verified","title":"20.175ct Purple–Green Colour Change Corundum Alexandrite | Pixel Cut | 13x18 mm | Gemdrop® Verified","description":"\u003cp\u003eA spectacular \u003cstrong\u003e20.175 ct lab-grown colour-change corundum Alexandrite\u003c\/strong\u003e featuring a dramatic \u003cstrong\u003epurple-to-green colour change\u003c\/strong\u003e under different lighting conditions.\u003c\/p\u003e\n\u003cp\u003eThis gem is \u003cstrong\u003ecorundum (Al₂O₃)\u003c\/strong\u003e, the same mineral family as ruby and sapphire. It displays an \u003cstrong\u003ealexandrite-like colour change\u003c\/strong\u003e, but it is \u003cstrong\u003enot chrysoberyl alexandrite\u003c\/strong\u003e. Gemdrop® clearly identifies both the underlying mineral and its optical appearance for complete transparency.\u003c\/p\u003e\n\u003ch2\u003eCzochralski-Grown Corundum\u003c\/h2\u003e\n\u003cp\u003eThis gem was created using the \u003cstrong\u003eCzochralski crystal growth process\u003c\/strong\u003e, producing high-quality single-crystal corundum with excellent clarity and colour.\u003c\/p\u003e\n\u003cp\u003eIts carefully controlled chemistry creates a distinctive colour-change effect:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCool\/daylight:\u003c\/strong\u003e Green tones\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWarm\/incandescent light:\u003c\/strong\u003e Purple tones\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt is genuine \u003cstrong\u003elaboratory-grown corundum\u003c\/strong\u003e, not glass or cubic zirconia, with the physical and chemical properties associated with synthetic sapphire.\u003c\/p\u003e\n\u003ch2\u003ePrecision Pixel Cut\u003c\/h2\u003e\n\u003cp\u003eThe striking \u003cstrong\u003ePixel Cut\u003c\/strong\u003e uses geometric faceting to create bold reflections, depth and a highly distinctive modern appearance.\u003c\/p\u003e\n\u003cp\u003eAt approximately \u003cstrong\u003e13x18 mm\u003c\/strong\u003e and \u003cstrong\u003e20.175 ct\u003c\/strong\u003e, this is a substantial statement gem ideal for bespoke jewellery, collector pieces and dramatic custom designs.\u003c\/p\u003e\n\u003cp\u003eWith a \u003cstrong\u003eMohs hardness of 9\u003c\/strong\u003e, corundum is highly durable and suitable for jewellery.\u003c\/p\u003e\n\u003ch2\u003eGemdrop® Verified\u003c\/h2\u003e\n\u003cp\u003eEvery Gemdrop® gem is \u003cstrong\u003escientifically verified\u003c\/strong\u003e and recorded in the \u003cstrong\u003eGemdrop Verification Database\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eVerification records document key gemmological information including identity, dimensions, growth method, crystal system and physical properties.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eGem Type:\u003c\/strong\u003e Colour-Change Corundum Alexandrite\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMineral:\u003c\/strong\u003e Corundum\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eChemical Formula:\u003c\/strong\u003e Al₂O₃\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCrystal System:\u003c\/strong\u003e Trigonal\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOrigin:\u003c\/strong\u003e Lab-Grown\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eGrowth Method:\u003c\/strong\u003e Czochralski\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eColour:\u003c\/strong\u003e Purple–Green Colour Change\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCut:\u003c\/strong\u003e Pixel Cut\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions:\u003c\/strong\u003e 13x18 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 20.175 ct\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHardness:\u003c\/strong\u003e 9 Mohs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eVerification:\u003c\/strong\u003e Gemdrop® Verified\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eScientifically verified. Transparently documented. A remarkable statement gem created through science.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Gemdrop","offers":[{"title":"Default Title","offer_id":58593522844022,"sku":null,"price":149.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1001\/5155\/8518\/files\/ED26BB2B-B4E6-4DF1-909D-7D29ADF7E240.jpg?v=1788349528","url":"https:\/\/gemdrop.io\/products\/20-175ct-purple-green-colour-change-corundum-alexandrite-pixel-cut-13x18-mm-gemdrop%c2%ae-verified","provider":"Gemdrop","version":"1.0","type":"link"}