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Gemological Resources

ASA Jewelry Appraisal Handbook

Gem Testing Techniques by Alan Hodgkinson

Articles of Interest

Cornerstone Archive

Tanzanite - Facts, Fears & Fakes
This presentation is made available at the request of the presenter. The subject matter has important implications for the global market. The AGA invites comments and/or opposing views.

About Surface Treated Color Diamonds

Laser Induced Breakdown Spectroscopy (LIBS) in Gemology

A Brief History of Heat: Heat Treatment of Ruby & Sapphire

Burma’s Jade Mines: An Annotated Occidental History

Vampire Blues: Surface-diffusion treated sapphires

The Skin Game: Orange sapphires pouring out of Thai burners’ ovens

Seeing Red: A Connoisseur’s Guide to Ruby.

Passion Fruit A Lover’s Guide to Sapphire

Love and Hate: Max Green’s stolen millions and the Lao sapphire mines

There's a Rumble in the Jungle: The Sapphire Face-lift Face-off Saga

Catfights: Enhancement Codes & Trade Wars

Cloak and Dagger: The Politics of Opticon

The Crying Game: Diamond Color Grading

Foreign Affairs: Fracture Healing / Filling of Möng Hsu Ruby

From Russia with Jade: A journey to Russia’s jade mines

Heaven & Hell: The Quest for Jade in Upper Burma

The Name Game: Conventions for selecting the names of precious stones

Pigeon’s Blood: A Pilgrimage to Mogok – Valley of Rubies

Rubies and Spinels of Afghanistan: A Brief History

Spinel Compounds: Background & Historical Perspective

Thailand’s Jewelry Industry: A ‘Black Paper’ on the State of the Trade

Tracing the Green Line: A Journey to Burma’s Jade Mines

Uncle Ho’s Rubies: Vietnam’s Quy Chau Ruby Mines

Where the Twain Do Meet: Thailand’s Gem-Trading Border Towns

Archive (.pdf files - requires Adobe Reader)

Cornerstone - Fall 1998

Cornerstone - November 1999

Cornerstone - December 1990

Cornerstone - December 1991

Cornerstone - February 1991

Cornerstone - Spring 1992

Cornerstone - Summer 1992

Cornerstone - Fall 1993

Cornerstone - Winter 1993

Cornerstone - Fall 1995

Cornerstone - Spring 1998

Cornerstone - Summer 1998

Cornerstone - Fall 1998

Cornerstone - Fall 1999

Cornerstone - Spring 1999

Cornerstone - Winter 1999

Cornerstone - Fall 2000

Cornerstone - Winter 2001

Cornerstone - Winter 2002

Cornerstone - Winter 2003




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