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Upcoming Seminars

Corundum Treatments

  • January 12, 2009
  • March 06, 2009
  • May 08, 2009

Emerald Treatments & Origin

  • January 13,2009
  • March 05, 2009
  • May 07, 2009
Mobile Lab Schedule

AGTA GemFair™ Tucson

  • Febuary 4 - 9, 2009

AGTA GemFair™ LAS VEGAS

  • May 29 - June 2, 2009
AGTA Membership

Learn the advantages of becoming an AGTA member

AGTA Foundation

Donate to the AGTA Foundation

 

JewelFolio: A New Direction in Gemology

 Rubies from Winza, Tanzania

 

 

 

Dye Corundum

JewelFolio: A New Direction in Gemology

 

JewelFolio: A New Direction in Gemology

 JewelFolio™
> putting the gem back in gemology

 

Imitation Melo Pearl

 Mellow melo
> an imitation melo pearl

Bad blues
> coated tanzanite hits the market

Coated tanzanite

Treated Green Amber

 Not easy being green
> a look at treated green amber

Dangerous curves
> verneuil synthetics reexamined

 Dangerous Curves

Tanzanite Grading Reports

 True blue
> tanzanite grading from the AGTA GTC

A visit to Madagascar
> is this ruby and sapphire nirvana?

Sapphire from Madagascar

Tourmaline
> pick your report preference

Tourmaline reports from the AGTA GTC

Gemological travel: hunting the mother lode abroad

 Gemological travel
> hunting the mother lode abroad

The Be blues
> beryllium in blue sapphire

 Treated sapphire