Step 3: Practical Gemology
You can use a refractometer to determine the refractive indexes of most cabochons and carved gems. If your test gems have a flat, polished bottom, you can test them as you would any faceted gem. If not, you can take a spot reading.
Cabochon Testing: Finding The Refractive Index
To test a gem with a curved surface, clean the stone thoroughly and set up your refractometer without the magnifying …
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