美国宝石研究院

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美国宝石研究院

2024-05-29 19:49| 来源: 网络整理| 查看: 265

Hand holding demantoid garnet rough in matrix.

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. Read More Examples include unheated brown specimens, heated rough material, and faceted stones.

Examples include unheated brown specimens, heated rough material, and faceted stones.

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. Read More Small trigons and a rough surface texture seen on a chondrodite crystal.

Small trigons and a rough surface texture seen on a chondrodite crystal.

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. Read More Diamond (left) and emerald (right) lenses.

Diamond (left) and emerald (right) lenses.

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. Read More “Healing Sisters” rings featuring amethyst and peridot.

“Healing Sisters” rings featuring amethyst and peridot.

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. Read More A 2.42 ct green diamond treated by radioactive salts.

A 2.42 ct green diamond treated by radioactive salts.

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. Read More

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美国宝石研究院

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