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Learn the latest on Madagascar sapphires and demantoid garnets from Wim Vertriest, GIA Manager of Field Gemology.
A reported new source of blue zircon in Malawi yields rough material for beautiful finished stones in the gem trade.
The Bangkok lab recently encountered a single round crystal of chondrodite in red spinel, a possible indicator of Burmese origin.
Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory.
The first installment of this column discusses the formation of colored stones from the crust-mantle transition and below.
The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of radiation treatment by the use of radioactive salts.
A reported new source of blue zircon in Malawi yields rough material for beautiful finished stones in the gem trade.
The Bangkok lab recently encountered a single round crystal of chondrodite in red spinel, a possible indicator of Burmese origin.
Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory.
The first installment of this column discusses the formation of colored stones from the crust-mantle transition and below.
The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of radiation treatment by the use of radioactive salts.
