Tag Archives: gemstone treatments

Not disclosing lead glass treatment risks consumer confidence

January 3, 2012

Industry groups are calling on sellers of lead glass-filled rubies to do the right thing and provide full disclose about the treatment.

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Tanzanite coating under industry scrutiny

June 16, 2008

A cobalt-based coating intended to improve the colour of tanzanite is the latest treatment to cause a stir.

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