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Shop gem refractometer
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How do you KNOW what a gem is? [Refractometer Tutorial]
All the tips and techniques you need to be competent identifying the vast majority of gemstones using the standard gemologist's refractometer. What kind should you buy and how do you use it correctly~ [Gempro refractometer] The gempro refractometer to my knowledge is no longer being produced. 2nd hand may be found perhaps. An alternative is at ...
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