How do you KNOW what a gem is Refractometer Tutorial

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=egpxFVwtNRo

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] • https://gemproducts.com/products

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