Step 3: Practical Gemology
Because surface treated gems are so common, it is important to know which treatments you are likely to encounter as well as how to test for them. Diffusion treatment, which involves applying a thin coating to a colorless cut stone, has been around for a while. Aqua aura quartz and mystic topaz are two of the most common diffusion treated gems; however, many topaz and sapphires are treated to improve their …
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