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Learn to Use a Refractometer (Video) - International Gem Society
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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~ More https://m.youtube.com/channel/UCX_C2IIrZqfXeSv4D7jRy0w | I Love Jewelry
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