{"product_id":"50-70-grams-swiss-blue-raw-topaz-for-faceting","title":"50.70 Grams Swiss Blue Raw Topaz for Faceting","description":"\u003cp\u003e\u003cspan\u003e50.70 grams Facet grade Swiss Blue Raw Topaz for cutting. Clarity of stones have eye clean to loupe clean. \u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eStone:\u003c\/strong\u003e Swiss Blue Topaz\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e : 50.70 grams\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eAverage:\u003c\/strong\u003e 6.5 grams per piece \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eClarity:\u003c\/strong\u003e Eye Clean to Loupe Clean \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Heated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin\u003c\/strong\u003e: Brazil\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"_h2_pkyxj_34\" id=\"technical-analysis-of-swiss-blue-raw-topaz\"\u003e\u003cspan\u003eTechnical Analysis of Swiss Blue Raw Topaz\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 class=\"_h3_pkyxj_40\" id=\"material-characteristics\"\u003eMaterial Characteristics\u003c\/h3\u003e\n\u003cul class=\"_ul_pkyxj_89\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSpecies\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Topaz (Al₂SiO₄(F,OH)₂)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eHardness\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: 8 on Mohs scale\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSpecific Gravity\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: 3.49-3.57\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCrystal System\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Orthorhombic\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eRefractive Index\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: 1.609-1.643 (biaxial positive)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTreatment\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Heat-treated Brazilian topaz\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTotal Weight\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: 50.70 grams (approximately 253.5 carats)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAverage Piece Size\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: 6.5 grams (~32.5 carats)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"_h3_pkyxj_40\" id=\"visual-assessment-from-image\"\u003eVisual Assessments\u003c\/h3\u003e\n\u003cp class=\"_p_pkyxj_65\"\u003e\u003cspan\u003eThe rough topaz parcel shows quality transparency with the characteristic Swiss blue color achieved through heat treatment. The stones display good size distribution for faceting, with clean crystal faces and minimal visible inclusions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 class=\"_h2_pkyxj_34\" id=\"faqs-for-gemstone-cutters--lapidary-artists\"\u003e\u003cspan\u003eFAQs for Gemstone Cutters \u0026amp; Lapidary Artists\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"_p_pkyxj_65\"\u003e\u003cstrong\u003e\u003cspan\u003eQ: What makes Swiss blue topaz ideal for faceting?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e A: Swiss blue topaz offers exceptional hardness (8), excellent clarity, and brilliant luster when properly cut. The heat-treated blue color is stable and won't fade with normal wear.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"_p_pkyxj_65\"\u003e\u003cstrong\u003e\u003cspan\u003eQ: What cutting challenges should I expect?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e A: Topaz has perfect cleavage parallel to the base, making it prone to splitting along this plane. The material is also brittle despite its hardness, requiring careful handling during all cutting stages.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"_p_pkyxj_65\"\u003e\u003cstrong\u003e\u003cspan\u003eQ: What's the best orientation for cutting these pieces?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e A: Always orient the table perpendicular to the c-axis to minimize cleavage risks. Examine each piece under magnification to identify the cleavage direction before planning your cut.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"_p_pkyxj_65\"\u003e\u003cstrong\u003e\u003cspan\u003eQ: What yield can I expect from this rough?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e A: With eye-clean to loupe-clean clarity, expect 35-50% yield depending on the final cut style. Conservative cutting may yield higher percentages but smaller stones.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"_p_pkyxj_65\"\u003e\u003cstrong\u003e\u003cspan\u003eQ: Are there any treatment considerations?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e A: The heat treatment is permanent and stable. However, avoid excessive heat during cutting as it may cause thermal shock and cracking.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"_p_pkyxj_65\"\u003e\u003cstrong\u003e\u003cspan\u003eQ: What cuts work best for Swiss blue topaz?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e A: Brilliant cuts, emerald cuts, and cushion cuts showcase the color beautifully. Avoid shallow cuts as they may appear washed out.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 class=\"_h2_pkyxj_34\" id=\"cutting-tips--guidelines\"\u003e\u003cspan\u003eCutting Tips \u0026amp; Guidelines\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 class=\"_h3_pkyxj_40\" id=\"pre-cutting-assessment\"\u003ePre-Cutting Assessment\u003c\/h3\u003e\n\u003col class=\"_ol_pkyxj_90\" start=\"1\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eExamine under 10x magnification\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for internal stress fractures\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCheck for cleavage planes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e using polarized light\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003ePlan cuts to maximize color saturation\u003c\/span\u003e\u003c\/strong\u003e\n\u003cul class=\"_ul_pkyxj_89\"\u003e\n\u003cli\u003e\u003cspan\u003edeeper pavilions enhance blue color\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eMark inclusion patterns\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e to plan around them\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3 class=\"_h3_pkyxj_40\" id=\"cutting-techniques\"\u003eCutting Techniques\u003c\/h3\u003e\n\u003cul class=\"_ul_pkyxj_89\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eDopping\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Use low-temperature wax; topaz is sensitive to thermal shock\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eRough shaping\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Work slowly with 220-400 grit to avoid chipping\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eFaceting\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Use 600-1200 grit for pre-polish, 3000-8000 for polish\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAngles\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Crown 40-43°, Pavilion 41-43° for optimal brilliance\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"_h3_pkyxj_40\" id=\"safety-precautions\"\u003eSafety Precautions\u003c\/h3\u003e\n\u003cul class=\"_ul_pkyxj_89\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAlways wear safety glasses\u003c\/span\u003e\u003c\/strong\u003e\n\u003cul class=\"_ul_pkyxj_89\"\u003e\n\u003cli\u003e\u003cspan\u003etopaz can chip unexpectedly\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eWork in well-ventilated area\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e when using cutting oils\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eUse light pressure\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e to prevent thermal buildup\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSupport the stone properly\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e to prevent cleavage fractures\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"_h3_pkyxj_40\" id=\"polishing-recommendations\"\u003ePolishing Recommendations\u003c\/h3\u003e\n\u003cul class=\"_ul_pkyxj_89\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003ePre-polish\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Diamond compound on copper or tin lap\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eFinal polish\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Cerium oxide or diamond paste on felt or leather\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSpeed\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Keep RPM moderate (200-400) to prevent overheating\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eDirection\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Polish perpendicular to cleavage planes when possible\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"_h3_pkyxj_40\" id=\"quality-control\"\u003eQuality Control\u003c\/h3\u003e\n\u003cul class=\"_ul_pkyxj_89\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCheck for stress fractures\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e after each major cutting stage\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eVerify symmetry\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e regularly during faceting\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTest polish quality\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e under different lighting conditions\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eFinal inspection\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e should include UV light check for fluorescence\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"_p_pkyxj_65\"\u003e\u003cspan\u003eThese Swiss blue topaz specimens offer excellent potential for creating beautiful faceted gems with proper technique and careful attention to the material's cleavage properties.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv style=\"position: absolute; left: -70px; top: 274.125px;\" id=\"gtx-trans\"\u003e\n\u003cdiv class=\"gtx-trans-icon\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Rough Facet Grade Gems","offers":[{"title":"Default Title","offer_id":51750070092098,"sku":null,"price":3300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0982\/5376\/6978\/files\/Rough-topaz.jpg?v=1767076925","url":"https:\/\/www.bullvendors19.com\/de\/products\/50-70-grams-swiss-blue-raw-topaz-for-faceting","provider":"Bull Vendors 19","version":"1.0","type":"link"}