Lead Glass-Filled Rubies
Lead glass-filled rubies represent material that’s heavily treated to improve transparency. The Gemological Institute of America (GIA) considers some of this material so heavily treated that it doesn’t warrant being called ruby at all, but rather a manufactured product. The treatment is highly unstable, resulting in stones that can be easily damaged beyond repair.

To gain a deeper understanding of lead glass-filled rubies, watch this video from the GIA Global Dispatch/GIA.edu.

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