Tag Archives: American Gemological Laboratories

AGL warns of new treated ruby variety

May 17, 2010

A new ruby treatment combining fissure healing and in-filling to improve a stone’s appearance is entering the market, says American Gemological Laboratories (AGL).

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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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