{"product_id":"lab-grown-columbia-emerald-round-shape-hand-cut-gemstone-vvs1-for-jewelry-rings-earrings-making-selectable-certificate","title":"Lab Grown Columbia Emerald Round Shape Hand-cut Gemstone VVS1 for Jewelry Rings Earrings Making Selectable Certificate","description":"\u003ch1\u003eSPECIFICATIONS\u003c\/h1\u003e\u003cp\u003e\u003cspan\u003eBrand Name\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eCHAOPAIZHIWU\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eCertificate\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eYes\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eCertificate Number\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eAs Certificate Number\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eCertificate Type\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eThird Party Appraisal\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eColor\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eEmemrald Green\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eFine or Fashion\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eFine\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eHigh-concerned chemical\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eNone\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eItem Height\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eStandard\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eItem Shape\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eRound Shape\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eItem Type\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003ebeads\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eItem Weight\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e0.5-10ct,0.5-10ct\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eMain Stone\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eEmerald\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eMetals Type\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eNone,Lab Grown Ememrald\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOrigin\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eMainland China\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eShape\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eEmerald Cut\u003c\/span\u003e\u003c\/p\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv style=\"margin:10px auto 0 !important;display:inline-block !important;max-width:100% !important;\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sa908ac93cb494978a1c03ca0b7b6c272H.jpg\" style=\"width:932px !important;\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan style=\"font-size:20px\"\u003e\u003cstrong\u003eLab-Grown Emerald\u003cbr\u003e\n1. Chemistry and Structure\u003cbr\u003e\nComposition: Identical to natural emeralds, lab-grown emeralds consist of beryllium aluminum silicate (Be₃Al₂(SiO₃)₆) with trace chromophores (chromium, vanadium) that produce their iconic green hue.\u003cbr\u003e\nSynthesis Methods:\u003cbr\u003e\nHydrothermal Method: Mimicking natural growth conditions, aluminum oxide, beryllium oxide, and other raw materials are dissolved in a high-temperature, high-pressure aqueous solution. Seed crystals induce controlled growth over 2–3 months.\u003cbr\u003e\nFlux Method: Raw materials are mixed with fluxes (e.g., lead molybdate) and heated to 1,400–1,500°C. Slow cooling allows emerald crystals to precipitate over 6–12 months.\u003cbr\u003e\n2. Physical Properties\u003cbr\u003e\nHardness: Mohs –(slightly lower than natural emeralds), requiring care to avoid scratches during daily wear.\u003cbr\u003e\nOptical Performance: Refractive index 1.566–1.602, birefringence 0.005–0.009, and dispersion 0.014 (lower than diamond). Vivid color but subdued fire.\u003cbr\u003e\nDensity: 2.67–2.78 g\/cm³, closely matching natural emeralds.\u003cbr\u003e\nInclusions: Hydrothermal-grown stones often show \"nailhead\" or \"cloud-like\" inclusions; flux-grown stones may contain flux residues or metallic filaments.\u003cbr\u003e\n3. Jewelry Applications\u003cbr\u003e\nCore Use Case: Affordable alternatives to natural emeralds (1\/10–1\/5 the cost), ideal for everyday jewelry or high-end custom designs.\u003cbr\u003e\nTreatment Techniques: Some products undergo oiling (to improve clarity) or surface coating (to enhance color), though treatments must be disclosed.\u003cbr\u003e\n4. Quality Grading\u003cbr\u003e\nColor: Graded by GIA standards from Light to Dark, with \"Emerald Green\" (vivid, saturated hue) being the most desirable.\u003cbr\u003e\nClarity: Lab-grown emeralds are typically cleaner (VS to IF grades) compared to naturally occurring stones, which often contain fractures and inclusions.\u003cbr\u003e\nCut: The classic emerald cut (step-cut) maximizes color display, requiring attention to proportion and symmetry.\u003cbr\u003e\nThis translation maintains technical precision, aligns with industry terminology, and preserves the original structure for clarity.\u003c\/strong\u003e\u003c\/span\u003e \u003cimg cke-id=\"img27\" referrerpolicy=\"no-referrer\" slate-data-type=\"image\" src=\"https:\/\/ae01.alicdn.com\/kf\/S1143957a18574e5daedb7fff2187b6196.jpg\"\u003e \u003cimg cke-id=\"img28\" referrerpolicy=\"no-referrer\" slate-data-type=\"image\" src=\"https:\/\/ae01.alicdn.com\/kf\/S0e536946d03b4f3ca2ae1c0d7d5c6df4K.jpg\"\u003e \u003cimg cke-id=\"img29\" 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