Article Search Results

Show Filters
Showing 25 results for "*"
A face-up view of a cushion cut diamond with blue color.
Article
Gems & Gemology’s 7 Most Unusual Encounters from 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

Read More

Micro-Features of Ruby
Inclusions in Natural, Synthetic and Treated Ruby

Provides a visual guide to the internal features of natural, synthetic and treated rubies.

Read More

Multi-colored gems are superimposed on an image of glacier peaks.
Article
Gems and Minerals from the Sub-Arctic

Circumnavigate the boreal reaches of the globe to explore gems from polar regions.

Read More

A petrographic thin section of ruby-diaoyudaoite slag.
Metallic Chromium Inclusions in Industrial By-Product Ruby

Inclusions in technogenic ruby slag help to separate this material from other specimens, both natural and synthetic.

Read More

Article
Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.

Read More

Article
Insights From Inclusions

Natural gemstones are typically far more valuable than synthetic ones, so being able to identify them correctly is a powerful skill.

Read More

Article
Gem Mining in Cambodia

How to examine a sapphire crystal for cracks and inclusions.

Read More

Flux-Induced Fingerprint Patterns in Synthetic Ruby: An Update

Some manufacturers are known to have treated Verneuil flame-fusion synthetic rubies by immersion in a flux melt to induce patterns like the “fingerprints” seen in some natural rubies.

Read More

New Rubies from the Morogoro Area, Tanzania
New Rubies from the Morogoro Area, Tanzania

The authors present the mineralogical and gemmological properties of rubies found recently in the Morogoro area of Tanzania that have many features in common with rubies from Myanmar (Burma) and other comparable marble-type deposits.

Read More

Rubies and Fancy Sapphires from Vietnam
Rubies and Fancy Sapphires from Vietnam

Gem-quality rubies and pink to purple sapphires are being recovered from the Luc Yen and Quy Chau mining regions of Vietnam.

Read More