Common Emerald Treatments
Most emeralds are treated to enhance their appearance. Even though treatments are common and accepted, they should be disclosed to buyers.
Nearly all emeralds are treated with oils or epoxy resins to fill-in surface cracks, making the cracks less visible and improving transparency.
Some coating oils are clear, some are tinted green to make the emeralds more vivid.
Most jewelers tell us to avoid cleaning emeralds with ultra-sonic devices, because that process can remove coatings.
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