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Refractive index chart (pdf download) - for 75 common gemstones
but it might have developed a fault
And the outer packaging is battered
built-in rechargeable batteries
Computerised gemstone gauge (presid PGCG) Resolution_0.1g Refractive index chart (pdf download)Summary AS A GEM GAUGE You might think to yourself: rather than measure a stone, look up charts and formulae, then use a calculator to work out the weight can't this all be done automatically, with a computer built into the gauge?? The answer is yes. Select the stone on the display, measure it, the weight will be displayed. This is the top model of gauge from the best manufacturers of electronic gem testing equipment. AS A GEM TESTER Weigh the stone
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