Diamond Tester, Gemstone Refractometer, Refractive Index 1.300-3.000, Measuring Accuracy 0.001, with LCD Display, Measuring Error ±0.005, Suitable for Various Gemstones
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Diamond Tester, Gemstone Refractometer, Refractive Index 1.…
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Gemstone laboratory. Specialist checks diamond or gem quality. Gemologist drops oil on the device to measure the refractive index of faceted stone. Diamond or gem grading and valuation
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