Article Search Results

Show Filters
Showing 63 results for "*"
Suite containing over 36 carats of Yogo sapphire
Gemological Characterization of Sapphires from Yogo Gulch, Montana

A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.

Read More

Montana sapphires after two rounds of heating
Big Sky Country Sapphire: Visiting Montana’s Alluvial Deposits

Documents a visit to the upper Missouri River and Rock Creek sapphire mining areas.

Read More

 Large open mussel shell with pink interior
Article
Freshwater Pearling in Tennessee

Natural pearl identification is one of the critical problems in pearl research. The DNA study of pearly mollusks and oysters facilitates solving this problem. To fulfill this goal, GIA sent a group from both research and education to Tennessee to sample the freshwater mollusks for DNA bar coding. Come with us to Camden, Tennessee, to see how we dive for pearly shells.

Read More

Man Sin mining
Hunting for
“Jedi” Spinels in Mogok

Documents a series of visits to Myanmar in search of exceptionally bright pinkish red spinels possessing no dark tones.

Read More

GIA Team
Article
Mozambique: A Ruby Discovery for the 21st Century

Join GIA on location at the Montepuez ruby mine in Mozambique, the most important ruby discovery of this new century.

Read More

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

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

Read More

Rubies and Sapphires from Winza, Central Tanzania

Since late 2007, rubies and sapphires have been mined by hand methods from both eluvial and primary deposits at Winza in central Tanzania.

Read More

Rough blue sapphire found near Ambatondrazaka.
Sapphire Rush Near Ambatondrazaka, Madagascar

A newly found deposit of sapphire in Madagascar is explored.

Read More

Hands holding sapphire
Article
Gem Fossicking: Recreational Mining in Australia

Fossicking is a special type of mining activity that Australians love. Australia is a large country rich in many types of gem resources. Come to Australia with the GIA field gemology team to feel the passion of gem fossicking in the southern hemisphere.

Read More

Blue and purplish sapphires are reportedly from Badakhshan Province, Afghanistan
Blue Sapphire Reportedly from Badakhshan, Afghanistan

Reports on the internal features and spectroscopic and trace-element analysis of sapphires reportedly from Badakhshan, Afghanistan.

Read More