{"product_id":"50-to-150-carats-unique-raw-sapphires-from-winza-bluish-purple-sapphires","title":"50 to 150 carats Unique Raw Sapphires from Winza- Bluish Purple Sapphires","description":"\u003ch3 class=\"p3\"\u003eGrab Small to Medium Deals of Natural Rough Bluish Sapphires\u003c\/h3\u003e\n\u003cp class=\"p4\"\u003eThese rough winza sapphires are unique due to duel color of blue and purple. Wiza sapphires looks beautiful after faceting or cabbing and gives unique hue and color. Available in 50 to 150-carat parcels\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003eKey Product Features\u003c\/h3\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eStone Name:\u003c\/b\u003e Natural Rough Sapphires\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cstrong\u003eTypes:\u003c\/strong\u003e Natural\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eWeight:\u003c\/b\u003e Total parcel weight – 50 to 150 carats\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eSize Range:\u003c\/b\u003e .50 cent up to 1.80 ct per piece (approximate)\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eColor Range: \u003c\/b\u003epurplish-pink, fuchsia, and magenta hues. \u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eTransparency: \u003c\/b\u003eModerate to good transparency, Included, Si, VS\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eTreatment:\u003c\/b\u003e Unheated\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eOrigin:\u003c\/b\u003e Winza region, Tanzania – famous for vibrant, high-quality corundum.\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eHardness:\u003c\/b\u003e 9 on Mohs Scale\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"p3\"\u003eTechnical Analysis of Winza Sapphires\u003cb\u003e\u003c\/b\u003e\n\u003c\/h2\u003e\n\u003ch3 class=\"p3\"\u003eVisual Analysis of Your Rough Sapphire Parcel:\u003c\/h3\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eColor Characteristics\u003c\/b\u003e: Distinctive blue-purple pleochroism with color zoning ranging from deep violet-blue to pinkish-purple . Inclusions of \u003cb\u003edeep indigo to bluish-black zoning\u003c\/b\u003e, indicating natural corundum growth\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eCrystal Habbits: \u003c\/b\u003e\n\u003c\/li\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003eHexagonal prismatic crystals with typical corundum morphology, showing both tabular and elongated forms \u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003eMixture of \u003cb\u003etabular\u003c\/b\u003e, \u003cb\u003ehexagonal\u003c\/b\u003e, and \u003cb\u003eirregular\u003c\/b\u003e shapes.\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003eSeveral crystals show good termination and could yield symmetrical stones.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eTransparency Range\u003c\/b\u003e: Semi-transparent to translucent with some opaque sections containing inclusions\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eSurface Features\u003c\/b\u003e: Natural crystal faces visible with some etching and weathering patterns typical of alluvial deposits\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eSize Distribution\u003c\/b\u003e: Mixed parcel showing stones from approximately 0.5ct to 1.8ct individual pieces\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eInclusion Patterns\u003c\/b\u003e: Visible rutile silk, color zoning, and natural fractures characteristic of Winza material\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"p3\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eMineral Composition\u003c\/b\u003e: Aluminum oxide (Al₂O₃) with trace chromium and iron causing color\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eCrystal System\u003c\/b\u003e: Trigonal (hexagonal appearance)\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eHardness\u003c\/b\u003e: 9 on Mohs scale\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eSpecific Gravity\u003c\/b\u003e: 3.95-4.03\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eRefractive Index\u003c\/b\u003e: 1.762-1.770 (birefringent)\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003ePleochroism\u003c\/b\u003e: Strong - violet-blue to purple-pink\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eOrigin Locality\u003c\/b\u003e: Winza, Mpwapwa District, Tanzania\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eFormation\u003c\/b\u003e: Metamorphic origin in marble deposits\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"p3\"\u003eCutting Potential Assessment:\u003c\/h3\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eFaceting Yield\u003c\/b\u003e: Approximately 35-45% weight retention expected \u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eOptimal Cuts\u003c\/b\u003e: Oval, cushion, and emerald cuts to maximize color display \u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eCabochon Suitability\u003c\/b\u003e: Excellent for star stones if silk inclusions are present \u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eColor Enhancement\u003c\/b\u003e: Heat treatment potential to improve clarity and color saturation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"p3\"\u003eFAQs for Gemstone Cutters - Sapphires\u003cb\u003e\u003c\/b\u003e\n\u003c\/h2\u003e\n\u003ch4 class=\"p3\"\u003e\u003cb\u003ePre-Cutting Evaluation\u003c\/b\u003e\u003c\/h4\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: How do I assess the cutting potential of rough Winza sapphires?\u003c\/b\u003e A: Examine under strong light for color zoning, check transparency with a penlight, and look for natural crystal faces that indicate orientation. Winza material often shows strong pleochroism, so orient the stone to maximize the best color.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eOpinion:\u003c\/strong\u003e\u003cspan\u003e Winza material can be tricky due to uneven color distribution, so patience in examination is key. I recommend using a daylight-equivalent LED to judge true color.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: What's the expected yield when cutting Winza sapphires?\u003c\/b\u003e A: Typically 35-50% weight retention, depending on inclusion patterns and desired final shape. The strong color zoning may require sacrificing weight to achieve even color distribution.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eOpinion:\u003c\/strong\u003e\u003cspan\u003e If the rough has heavy inclusions, consider a lower-yield design (e.g., a concave cut) to maximize brilliance over carat weight. Winza’s unique color makes it worth the trade-off.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: Should I heat treat Winza sapphires before cutting?\u003c\/b\u003e A: Many cutters prefer to cut first, then heat treat if needed. Winza sapphires often improve with gentle heating (1000-1200°C) to reduce silk and enhance color saturation.\u003c\/p\u003e\n\u003ch4 class=\"p3\"\u003e\u003cb\u003eCutting Techniques\u003c\/b\u003e\u003c\/h4\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: What's the best orientation for cutting Winza sapphires?\u003c\/b\u003e A: Orient the table perpendicular to the c-axis to minimize pleochroism and achieve the most attractive face-up color. The blue-purple zones should be positioned to create an even color blend.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: Which cutting wheels work best for sapphire?\u003c\/b\u003e A: Start with 220-grit diamond for shaping, progress through 600, 1200, 3000, and finish with 8000-grit or higher. Ceramic wheels work well for final polishing.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: How do I handle the strong pleochroism in Winza sapphires?\u003c\/b\u003e A: Use a dichroscope during orientation to identify the best viewing direction. Position the stone so the most attractive color combination is visible face-up.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eOpinion:\u003c\/strong\u003e\u003cspan\u003e I prefer orienting Winzas to showcase their \u003c\/span\u003e\u003cstrong\u003ereddish-pink\u003c\/strong\u003e\u003cspan\u003e tones, as these are rarer and more marketable. However, some cutters prioritize blue for a cooler look—personal preference matters!\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 class=\"p3\"\u003e\u003cb\u003eCommon Challenges\u003c\/b\u003e\u003c\/h4\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: Why do my Winza sapphires chip during cutting?\u003c\/b\u003e A: Check for internal stress fractures and natural parting planes. Use lighter pressure and ensure your lap is running true. Winza material can be brittle due to inclusion patterns.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: How do I deal with color zoning in the rough?\u003c\/b\u003e A: Plan your cut to either embrace the zoning as a feature or position it to minimize visibility. Sometimes a slightly smaller stone with even color is preferable to a larger zoned stone.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: What causes the milky appearance in some areas?\u003c\/b\u003e A: Fine rutile silk inclusions create this effect. Gentle heat treatment can often dissolve these inclusions, but test on a small piece first.\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch4 class=\"p3\"\u003e\u003cb\u003eFinishing and Polish\u003c\/b\u003e\u003c\/h4\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: What's the best polish for Winza sapphires?\u003c\/b\u003e A: Diamond compound on a tin lap gives excellent results. Cerium oxide on felt also works well for the final polish. Maintain consistent pressure and speed.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: How do I achieve that perfect mirror finish?\u003c\/b\u003e A: Ensure each grit stage is complete before moving to the next. Clean the stone thoroughly between stages. Use a quality diamond compound and maintain your laps properly.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: Why do some facets appear duller than others?\u003c\/b\u003e A: This often indicates incomplete polishing at previous stages or contamination between grits. Re-polish with the previous grit stage and ensure thorough cleaning.\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch4 class=\"p3\"\u003e\u003cb\u003eValue Optimization\u003c\/b\u003e\u003c\/h4\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: What cuts maximize value for Winza sapphires?\u003c\/b\u003e A: Oval and cushion cuts typically yield the best color and minimize waste. Round brilliants can be stunning but have lower yield. Consider the rough's natural shape when planning.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: When should I consider cabochon cutting instead of faceting?\u003c\/b\u003e A: If the material shows strong silk that might create asterism, or if transparency is too low for effective faceting. Winza sapphires can produce beautiful star stones.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eQ: How do I price my finished Winza sapphires?\u003c\/b\u003e A: Consider color saturation, clarity, cut quality, and carat weight. Winza sapphires with good color and clarity can command premium prices due to their unique origin and distinctive color.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eThis analysis should help you maximize the potential of your beautiful Winza sapphire rough material!\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch2 class=\"p3\"\u003eCutting Tips for Lapidary Artists\u003c\/h2\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eOrientation is Key:\u003c\/b\u003e\u003cbr\u003ePosition the table perpendicular to the color zoning to maximize color play and avoid “dead” areas.\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eUse Gentle Preforming:\u003c\/b\u003e\u003cbr\u003eUse a fine lap to preform – these crystals have natural fractures that may split under aggressive shaping.\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eDeal with Zoning Smartly:\u003c\/b\u003e\u003cbr\u003eSome stones have visible color zoning or black rutile\/silk inclusions. Consider \u003ci\u003ebrilliant cuts\u003c\/i\u003e to mask zoning or use \u003ci\u003ecabochon\u003c\/i\u003e finish for opaque or heavily included stones.\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003eHeat Potential:\u003c\/b\u003e\u003cbr\u003eIf clarity improvement is desired, these sapphires may respond well to \u003cb\u003eheat treatment\u003c\/b\u003e. Always test a sample before applying to the full lot.\u003c\/li\u003e\n\u003cli class=\"li4\"\u003e\n\u003cspan class=\"s1\"\u003e\u003c\/span\u003e\u003cb\u003ePolishing Suggestion:\u003c\/b\u003e\u003cbr\u003eUse \u003cb\u003ediamond paste (50k–100k grit)\u003c\/b\u003e on tin or Lucite laps for excellent luster.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Folkmarketgems","offers":[{"title":"50","offer_id":51750046007618,"sku":null,"price":3300.0,"currency_code":"USD","in_stock":true},{"title":"100","offer_id":51750046040386,"sku":null,"price":7200.0,"currency_code":"USD","in_stock":true},{"title":"150","offer_id":51750046073154,"sku":null,"price":9000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0982\/5376\/6978\/files\/Rough-winza-sapphires.jpg?v=1767075964","url":"https:\/\/www.bullvendors19.com\/de\/products\/50-to-150-carats-unique-raw-sapphires-from-winza-bluish-purple-sapphires","provider":"Bull Vendors 19","version":"1.0","type":"link"}