Glass-Filled Fractures in Ruby—Like Diamond

The Sept. 3 edition of the Gübelin Gem Lab (GGL) newsletter announced that "lead-filled rubies" were entering the market. According to the newsletter, "The clarity enhancement of ruby with a lead-based filler might now be considered noted in heat-treated rubies. Heat-treated rubies filled with a lead-glass substance, intended to improve the clarity, were submitted to the lab for testing. The results on the certificate stated indications of heating, as well as a complementary comment: additional clarity enhancement with a lead-glass." Prior to that, the Gemmological Association of All Japan (GAAJ) and the American Gem Trade Association (AGTA) Gem Testing Center (GTC) laboratory had made similar announcements. GIA's gem lab also recently made this same announcement. Fracture filling is not new. Most varieties of gems can be, and have been, fracture filled. Emerald is the most commonly

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