GemNotes

Getting a Better Fix On Emerald Fillers Now that it’s common knowledge nearly every emerald is clarity-enhanced, jewelers and consumers alike want to know just how effective and stable the enhancements are. They also want to know which treatment has been applied to their stone. And, if given a choice, they’d like to know which is the best to use. Researchers at the Gemological Institute of America are trying to provide some answers. Last year, GIA’s researchers set out to determine which emerald fillers are being used, the stability of each, and how to identify them. They reported the first part of their study, which clears up the gemological nomenclature and lists the properties of fillers, in the Summer 1999 issue of Gems & Gemology. It’s a useful report. Here’s a brief summary. Fill ’er up. Led by Dr. Mary Johnson, GIA’s research staff has listed the properties
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