Glass (Lead) infilling
External: Open cavities (usually on pavilion), filled with glass for a better looking stone (seals cavities, adds weight). Internal: Traces of glassy residue in fractures after heating may be found as a by-product of the particular heating process used. (Stable).
Detection: Magnification. Differences in luster between glass infilling and stone plus possible bubbles in filling and blue orange flashes.For more information about treatment please click on the below link
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