Abstracts of speaker presentations from the “New Technologies and Techniques” session of GIA’s 2018 International Gemological Symposium.

Poster abstracts on “General Gemology and Jewelry” from GIA’s 2018 International Gemological Symposium.

Abstracts of speaker presentations from the “Diamond Identification” session of GIA’s 2018 International Gemological Symposium.

Abstracts of speaker presentations from the “Gem Localities and Formation” session of GIA’s 2018 International Gemological Symposium.

Abstracts of speaker presentations from the “General Gemology and Jewelry” session of GIA’s 2018 International Gemological Symposium.

Abstracts of speaker presentations from the “New Technologies and Techniques” session of GIA’s 2018 International Gemological Symposium.

Poster abstracts on “Colored Stones and Pearls” from GIA’s 2018 International Gemological Symposium.

Abstracts of speaker presentations from the “Gem Characterization” session of GIA’s 2018 International Gemological Symposium.

Poster abstracts on “Gem Characterization” from GIA’s 2018 International Gemological Symposium.

秋季，大自然赐予我们色彩亮丽的变色树叶，还有缤纷落日照射形成的绚丽万花筒。

Projects developed by the GemHub to benefit miners, cutters, and others involved in the gem and jewelry industry.

The DiamondView instrument is able to identify glass as the filler in a pair of heart-shaped rubies.

Gold: Vortex, Virtues, and Values was hosted by Initiatives in Art and Culture (IAC) at Bohemian National Hall in New York City, April 12–13. Now in its eighth year, the conference has become an annual industry gathering for those looking to evaluate the market, discover exceptional work, and discuss key gold-related issues.

The first known group of color-change gem-quality chrome grossular garnet, reportedly from Ethiopia, is examined in GIA’s Carlsbad lab.

A transparent greenish blue pear-shaped gemstone, reportedly from Madagascar, is discovered to be a Maxixe-type beryl.

A jade bracelet contains unusual fillers, used to create a smooth surface.

aser confocal microscopy, a very reliable method of revealing surface micro-features, is used on an HPHT synthetic diamond to reveal growth structures.

An update the gemological and chemical characteristics of golden sheen sapphires from Kenya.

An unusual assembled stone is examined at GIA’s New York lab.

Crassostrea virginica, the so-called Eastern or American oyster, is a commercial seafood widely distributed along the east coast of the United States to the Gulf of Mexico.