{"product_id":"gem-refractometer","title":"Gem Refractometer","description":"\u003cp\u003eThe gem refractometer is the most important tool for gem determination and the most powerful instrument for identifying gem species. It measures the refractive index value of gemstones non-destructively, quickly, and accurately, while determining other critical optical characteristics.\u003cbr\u003e\u003cbr\u003eFeatures a high-refractive-index lead glass test prism with a measurement range of 1.30–1.81 and ±0.002 accuracy. Built-in LED light source eliminates external dependencies. Professional optical design with narrow-wavelength quasi-single LED light delivers an ultra-flat, razor-sharp shadow boundary for precise readings. High-contrast ruler with black background enhances interface clarity for confident gem identification in any lighting condition.\u003cbr\u003e\u003cbr\u003eEssential for gemologists, appraisers, and serious collectors seeking reliable, non-destructive gem analysis.  \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eAccuracy: \u003c\/strong\u003e±0.002\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eEyepiece Diameter: \u003c\/strong\u003e16mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eRange:\u003c\/strong\u003e the refractive index is within 1.30-1.81\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFunction: \u003c\/strong\u003eIdentify gemstones by refractive index\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eBattery type: \u003c\/strong\u003eButton battery (not included)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eWeight: \u003c\/strong\u003e317.5g\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSize: \u003c\/strong\u003e113mm*32mm*61mm (L*W*H)\u003c\/span\u003e\u003c\/p\u003e","brand":"AliExpress","offers":[{"title":"Default Title","offer_id":53246388502709,"sku":"Portable Gem Refractometer","price":189.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0251\/1947\/files\/0AFD1F72-B0A1-4C03-892A-54C58E257F82.png?v=1789057773","url":"https:\/\/zakjewelrytools.com\/products\/gem-refractometer","provider":"DECOZE JEWELRY TOOLS","version":"1.0","type":"link"}