Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.
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A report on a 1.17 ct emerald obtained in Kabul, Afghanistan for GIA's permanent reference collection
Read MoreCriteria for distinguishing emerald filling substances were investigated.
Read MoreMananjary emeralds usually can be separated from emeralds from other localities by means of associations of certain mineral inclusions.
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Emeralds are again being mined in the historic district of the Ural Mountains. Physical, chemical, spectroscopic and microscopic characteristics of stones from the recent production are presented and compared with data on older samples as well as those reported in the literature.
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The filling of surface-reaching breaks in emeralds is a relatively common practice, for which various kinds of oils and a natural resin have historically been used.
Read MoreThe technique is nondestructive and, with Fourier transform instrumentation, extremely rapid in comparison to most laboratory methods.
Read MoreThe Coscuez mine, one of a number in Colombia, is rapidly gaining significance as a major source of fine emeralds.
Read MoreFrom the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.
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This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
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