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研究与新闻
FIELD GEMOLOGY UPDATE
The Latest in Field Gemology from Wim Vertriest
Learn the latest on Madagascar sapphires and demantoid garnets from Wim Vertriest, GIA Manager of Field Gemology.
GEM NEWS INTERNATIONAL
Blue Zircon Reportedly from Malawi
A reported new source of blue zircon in Malawi yields rough material for beautiful finished stones in the gem trade.
Micro-World
Chondrodite in Red Spinel from Mogok, Myanmar
The Bangkok lab recently encountered a single round crystal of chondrodite in red spinel, a possible indicator of Burmese origin.
COLORED STONES UNEARTHED
Colored Stones from the Deep
The first installment of this column discusses the formation of colored stones from the crust-mantle transition and below.
MICRO-WORLD
Radioactive Green Diamond
The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of radiation treatment by the use of radioactive salts.
LAB NOTES
Two Antique Mughal Spectacles with Gemstone Lenses
Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory.
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