{"product_id":"spinel-card-by-gem-tech-c-2018","title":"Spinel Card by GEM-TECH (c.2018)","description":"\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAAIBxAA\" data-complete=\"true\" data-processed=\"true\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAAIDRAA\" data-complete=\"true\" data-processed=\"true\"\u003eThe \u003cspan class=\"rQesXe MPyX\"\u003eSpinel Card\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e (also widely distributed as the Double Polaris Card) is an iconic, low-cost field instrument developed by local engineering innovators in Sri Lanka, most prominently popularized by certified regional suppliers like \u003cspan class=\"R78TQ\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\" data-processed=\"true\"\u003e\u003cspan data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\" data-processed=\"true\"\u003e\u003ca class=\"gQWhZ\" rel=\"noopener\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-ved=\"2ahUKEwihgbT5kPeXAxXQETQIHcwiI9EQy_kOegYIAAgNEAE\" data-hveid=\"CAAIDRAB\" href=\"https:\/\/www.sujanijewellers.com\/product\/polaris-spinel-card-for-gems\/\" data-complete=\"true\" data-processed=\"true\" target=\"_blank\"\u003eSujani Jewellers\u003c!--TgQPHd|||[[\u0026quot;https:\/\/www.sujanijewellers.com\/product\/polaris-spinel-card-for-gems\/\u0026quot;,null,[null,null,1,null,null,null,null,null,null,[[1794098288459937,137630160,3508740812],null,null,null,null,[[0,12]]],null,null,[244939,null,2],null,null,[{\u0026quot;1218\u0026quot;:[16,null,null,null,[1,1008,6,6]]}]],null,null,2,null,null,null,null,0]]--\u003e\u003c\/a\u003e\u003c!--TgQPHd|||[[[null,null,null,null,null,null,[[1794098288459937,137630160,3508740812],null,null,null,null,[[0,12]]],\u0026quot;https:\/\/www.sujanijewellers.com\/product\/polaris-spinel-card-for-gems\/\u0026quot;],0,0],\u0026quot;\\u0026d4tZ0b_u:u9afN\u0026quot;,\u0026quot;\\u0026d4tZ0b_u:kEV45c\u0026quot;]--\u003e\u003c\/span\u003e\u003c!--TgQPHd|||[[\u0026quot;https:\/\/www.sujanijewellers.com\/product\/polaris-spinel-card-for-gems\/\u0026quot;,null,null,[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,[{\u0026quot;1218\u0026quot;:[16,null,null,null,[1,1008,6,6]]}]],16,null,\u0026quot;Polaris \/ Spinel Taaffeite Card \/ Double Card For Gems ( B ) · Sujani Jewellers\u0026quot;,\u0026quot;Product: Polaris \/ Spinel Taaffeite Card \/ Double Card For Gems (B) | Brand: Bright Beam® | Vendor: Sujani Jewellers (Kadawatha) | Price: රු400 (discounted from රු1,000, 60% save) | Availability: In stock | Purpose: Ceylon handmade gem inspection card to identify single or double refractive gemstones and Taaffeite | Size: 25cm X 20cm | Operation: Place card near sunlight\/torch, place gemstone in the middle between both cards, and rotate to observe colour changes indicating refraction | Services: Card payment accepted, island-wide delivery available | Hotline: 0764477773\u0026quot;,\u0026quot;https:\/\/encrypted-tbn1.gstatic.com\/images?q\\u003dtbn:ANd9GcRSRgps0u_29C5g07OZVexdbxTYMjG9Q2V-kZpgrLsvbr5qcLWMvU1xS-rSDPNqhv2ZQs1bqIWghgrLB4I\u0026quot;,\u0026quot;Sujani Jewellers\u0026quot;,\u0026quot;https:\/\/encrypted-tbn3.gstatic.com\/faviconV2?url\\u003dhttps:\/\/www.sujanijewellers.com\\u0026client\\u003dAIM\\u0026size\\u003d32\\u0026type\\u003dFAVICON\\u0026fallback_opts\\u003dTYPE,SIZE,URL\u0026quot;,[[1794098288459937,137630160,3508740812],null,null,null,null,[[0,12]]],null,\u0026quot;4d5d9ba9-5536-4794-8355-b6baaef756a8\u0026quot;]]--\u003e\u003c\/span\u003e. While informal card-based field polariscopes began trickling into traditional Ceylonese trading circles in the late 1990s as tools like the original \u003cspan class=\"rQesXe MPyX\"\u003eBright Beam® Spinel Card\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e were standardized, the timeline is tied to the specialized distribution networks that formally expanded in \u003cspan class=\"rQesXe MPyX\"\u003e1997\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e. Engineered to save rough-stone buyers from carrying heavy desktop machinery into muddy mining pits, this compact design bypassed steep entry costs. While standard retail prices fluctuate around \u003cspan class=\"rQesXe MPyX\"\u003eරු 1,000 to රု 2,200 LKR (approx. $3.50 to $7.50 USD)\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e in the modern market, its massive value comes from democratizing accessible optical diagnostics across regional trading hubs like Ratnapura.\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"yhAwj\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\" data-processed=\"true\" data-sfc-inited=\"2\"\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/div\u003e\n\u003cdiv class=\"ZLzG0d ncoeY E8xBUb\" role=\"heading\" aria-level=\"4\" data-animation-nesting=\"\" data-sfc-cp=\"\" data-wiz-attrbind=\"aria-level=d4tZ0b_18\/fLk2Md\" data-sfc-root=\"c\" data-hveid=\"CAAIERAA\" data-complete=\"true\" data-processed=\"true\" data-sae=\"\"\u003e\n\u003cbr\u003e\u003c!--TgQPHd|||[[2,[null,null,1,null,null,null,null,null,null,null,null,null,[351768,null,0]],[],null,1]]--\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAAIEhAA\" data-complete=\"true\" data-processed=\"true\"\u003eAt its mechanical core, this artifact completely strips away the bulky housings, heavy glass optics, and electrical cords of lab-grade equipment, relying on an ultra-minimalist \u003cspan class=\"rQesXe MPyX\"\u003esandwich-board folding architecture\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e. Measuring roughly 25cm by 20cm, the body is handmade in Ceylon using rigid, high-gloss laminated card stock or plastic sheets. Cut directly into the upper and lower flaps of the card are two perfectly aligned windows containing professional-grade, high-efficiency \u003cspan class=\"rQesXe MPyX\"\u003epolarized plastic lenses\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e. These sheets are permanently oriented in a \"crossed\" position to act as an integrated polarizer and analyzer set. When light enters from the bottom, it becomes plane-polarized, enabling the user to immediately track light variations inside a sample nestled between the layers without requiring any integrated battery packs. \u003c!--TgQPHd|||[[2,[null,null,1,null,null,null,null,null,null,null,null,null,[351768,null,0]],[],null,1]]--\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAAIEhAA\" data-complete=\"true\" data-processed=\"true\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAAIFRAA\" data-complete=\"true\" data-processed=\"true\" aria-owns=\"action-menu-parent-container\"\u003eThe primary operational highlight of the Spinel Card is its ability to instantly isolate single refractive (SR) and double refractive (DR) gemstones under natural ambient sunlight or a basic flashlight. To test a specimen, the user places the rough stone between the two polarized windows and slowly rotates it 360 degrees. If the crystal remains completely dark during the rotation, it indicates single refraction—a definitive diagnostic hallmark of genuine spinel or garnet. Conversely, if the stone flashes light and dark, it reveals double refraction. This rapid field-testing capability makes the card legendary across Sri Lankan trade floors for unmasking incredibly rare, high-value \u003cspan class=\"rQesXe MPyX\"\u003eTaaffeite gemstones\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e, which mimic spinel rough perfectly but possess a distinct doubly refractive optical signature.\u003c\/div\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAAIFRAA\" data-complete=\"true\" data-processed=\"true\" aria-owns=\"action-menu-parent-container\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAAIFRAA\" data-complete=\"true\" data-processed=\"true\" aria-owns=\"action-menu-parent-container\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eWhile informal, flexible paper and laminated card stock versions dominated the gem pits of Ratnapura through the early 2000s, GEM-TECH introduced this \"Professional Use\" edition in \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\" data-processed=\"true\"\u003e2018\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e to address a major weakness of the original designs: environmental wear. Mining field environments are notoriously humid and muddy, which caused traditional cardboard versions to easily warp, split at the hinges, or suffer from scratched filters over time.\u003cspan\u003e \u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"yhAwj\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\" data-processed=\"true\" data-sfc-inited=\"2\"\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/div\u003e","brand":"Gems.studio","offers":[{"title":"Default Title","offer_id":68056043815232,"sku":null,"price":0.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/0397\/2672\/files\/CeylonPolariscope_1.avif?v=1794097654","url":"https:\/\/gems.studio\/products\/spinel-card-by-gem-tech-c-2018","provider":"Gems.studio","version":"1.0","type":"link"}