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The 2013 CIBJO Congress in session in Tel Aviv.

  CIBJO endorses specific nomenclature for heavily glass-filled rubies

May 15, 2013

The issue of glass-filled rubies featured strongly upon the agenda of the World Jewelry Confederation's Colored Stone Commission and the Gemological Commission, which met at the 2013 CIBJO Congress in Tel Aviv in early May. Of particular concern were what are termed "heavily glass filled rubies."

In a special report released before the event in Tel Aviv, Gemological Commission President Hanco Zwaan had noted the position of the Laboratory Manual Harmonization Committee (LMHC), as explained by Elena Gambini head of the Gem Materials Laboratory Department at CISGEM, who had stressed that that one must be able to distinguish those instances where the filled fractures actually hold the stone together. Such stones, she pointed out, would comply with the definition of "heavily filled stones."

Ms. Gambini discussed the various options and ways to describe such stones and presented an additional category, which she described as: "manufactured product or (natural) corundum with/and glass."

Speaking at the congress, Colored Stone Commission President, Nilam Alawdeen, noted that the issue concerning proper nomenclature for heavily glass filled rubies had not been properly resolved at the 2012 CIBJO Congress in Vicenza, Italy, and it was a matter of urgency that it be addressed.

During its meeting, the CIBJO Colored Stone Commission endorsed the LMHC terminology, deciding that any heavily glass filled material should be called "manufactured/composite material or product" under variety/type and under its commercial name. In order to accommodate the new nomenclature, the term "composite" as described in the CIBJO Gemstone Blue Book will be altered.

The Colored Stone commission recommended that the new nomenclature apply not only to rubies, but also to all sapphires and emeralds. It was also recommended that the inherent instability of the stones that have been heavily glass filled should also be conveyed as part of the disclosure requirement.

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