{"product_id":"refractometer","title":"Refractometer","description":"\u003ch2\u003eSummary\u003c\/h2\u003e\n\u003cp\u003eFor the gemmologist the refractometer is the most important gem tester after a loupe. It measures refractive index (to what extent light is bent as it passes through the gemstone).\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThis product is intended for gemmologists (or those about to study gemmology) - instructions are not included.\u003c\/em\u003e  \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGuarantee: 1 year.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eDetail\u003c\/h2\u003e\n\u003cp\u003eApprox. 5 X 3 X 2 inches\u003c\/p\u003e\n\u003cp\u003eBuilt-in monochromatic LED light\u003c\/p\u003e\n\u003cp\u003eRange: 1.30 to 1.81\u003c\/p\u003e\n\u003cp\u003ePossible error in readings: +\/- 0.01\u003c\/p\u003e\n\u003cp\u003eTest plate made of high-refractive glass\u003c\/p\u003e\n\u003cp\u003ePower: Takes 3 size LR44 batteries (included).\u003c\/p\u003e\n\u003cp\u003eBottle of contact fluid included. \u003c\/p\u003e\n\u003ch2\u003eIs it easy to use?\u003c\/h2\u003e\n\u003cp\u003eBASIC OPERATION: Rest the flat polished surface of the stone on the test plate, and through the viewfinder you see a scale, part of which will be light and part of which will be dark. In between the light and dark is the 'shadow edge' (which will be quite sharp, due the monochromatic light) - this marks a reading on a scale. It's a little slow and fiddly but not too difficult to master.\u003c\/p\u003e\n\u003cp\u003eADVANCED OPERATION: Not only do you get a reading, but often you will see two shadow edges, indicating a doubly refractive stone (which, itself, is diagnostic), AND advanced users can glean further information by rotating the stone to see if either or both of the shadow edges move, and by taking minimum and maximum readings for each. \u003c\/p\u003e\n\u003ch2\u003eAlternative gem testers\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003ePlease note, none of these testers will distinguish natural stones from synthetic stones. \"Synthetic\" is a scientific term meaning 'made by man in a factory\/laboratory to the same formula found in nature', the two are usually indistinguishable. \u003c\/p\u003e\n\u003ctable width=\"627\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 99px;\"\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: left;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eTests\u003cspan\u003e \u003c\/span\u003e\u003cem\u003emounted\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003estones [1]\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eTests  Diamond\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eTests  Moissanite\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eTests\u003cbr\u003eRuby \/ \u003cbr\u003e\u003c\/strong\u003e\u003cstrong\u003eSapphire\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eOther stones\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 120px;\"\u003e\n\u003ctd style=\"height: 120px;\"\u003e\n\u003cp style=\"text-align: left;\"\u003eHandheld presidium gem tester (GEMTEST-PGI)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 120px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✔\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 120px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✔\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 120px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003eShows up as diamond\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 120px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✔\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 120px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e31 stones\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 99px;\"\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: left;\"\u003eStandard Presidium (GEMTEST-P2)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✔\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✔\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eShows up as diamond\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✔\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e17 stones\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 99px;\"\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: left;\"\u003ePresidium Duo gem tester (GEMTEST-DUO-II)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e[2]\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✔\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✔\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✔\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 99px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e[3]\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 120px;\"\u003e\n\u003ctd style=\"height: 120px;\"\u003e\n\u003cp style=\"text-align: left;\"\u003eDigital refractometer by Presidium (REFRACT-DIGI-PRESID)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 120px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✘\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 120px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✔\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 120px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✔\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 120px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e✔\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 120px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e55 stones\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e[1] All testers test loose stones but not all can test mounted (set in jewellery) stones.\u003c\/p\u003e\n\u003cp\u003e[2] The probe \/ analogue meter will test mounted stones, the digital meter will only test loose stones.\u003c\/p\u003e\n\u003cp\u003e[3] The probe \/ analogue meter: 17 stones; the digital meter: 40 stones.\u003c\/p\u003e\n\u003cp\u003e[4] Skill and practice is required to use an optical refractometer, instructions are not included, see any textbook about gemmology…or the internet.   \u003c\/p\u003e\n\u003ch2\u003eLimitations\u003c\/h2\u003e\n\u003cp\u003eAlthough this is an 'easy' test because you end up with a number, and you look up the number on standard charts, you will soon discover that (as with all gem testers) there are many gemstones with the same (or overlapping) readings. A refractometer will help you narrow the possibilities to a handful (maybe one or two) stones, but it will not give an instant 100% guaranteed answer.\u003c\/p\u003e\n\u003cp\u003eSome stones are out of range for this machine (their refractive index is too high to be measured) including some garnets, diamonds and most diamond simulants including zircon and sphene. This cannot, therefore, be used as a diamond tester.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Quicktest","offers":[{"title":"Default Title","offer_id":53527288971553,"sku":"gwr1789754083931","price":181.33,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0986\/6798\/7233\/files\/refractometer_1.jpg?v=1789754088","url":"https:\/\/bamboobreathclad.shop\/products\/refractometer","provider":"My Store","version":"1.0","type":"link"}