Article Search Results

Show Filters
Showing 157 results for "������������������������������2���"
Chatoyancy on one side of green bead.
A Cat’s-Eye Rock Consisting of Jadeite and Amphibole

Raman spectroscopy reveals that a green bead, showing chatoyancy on one side, comprises jadeite and amphibole.

Read More

Faceted wurtzite
Rare Faceted Wurtzite

A stone submitted for identification is revealed to be the first wurtzite examined by the GIA lab.

Read More

Greenish yellow doublets.
Synthetic Sapphire and Synthetic Spinel Doublets

Unusual doublets created from two different synthetics are revealed at the Carlsbad laboratory.

Read More

Large Fluorite Sphere
Fluorite Sphere with Phosphorescent Coating

A sphere with unusual phosphorescence is seen in the Carlsbad laboratory.

Read More

Summer 1998 G&G Lab Notes

This section, from the Summer 1998 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

Read More

Summer 1993 G&G Lab Notes

This section, from the Summer 1993 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

Read More

Summer 1990 G&G Lab Notes

This section, from the Summer 1990 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

Read More

151451
Calcium Fluoride Coating Found on 13 "Fancy" Pink Diamonds

Recent lab examination reveals that traditional treatments such as calcium fluoride coating are still prevalent in the trade, and great care must be taken to identify them.

Read More

0.34 ct CVD synthetic
CVD Synthetic Diamond with Unusual Inclusions

Examination of a CVD synthetic diamond with an unusual pattern of growth dislocations that resemble natural inclusions.

Read More

Summer 2000 G&G Lab Notes

This section, from the Summer 2000 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

Read More