• Cover of Gems & Gemology Winter 2011 issue, featuring rough and polished opal

Winter 2011

  • $15.00

The PDF version of this issue is available at no charge. Visit

Dyed Purple Hydrophane Opal
Nathan Renfro and Shane F. McClure

Determining Garnet Composition from Magnetic Susceptibility And Other Properties
Donald B. Hoover

GIA's Symmetry Grading Boundaries for Round Brilliant Cut Diamonds
Ron H. Geurts, Ilene M. Reinitz, Troy Blodgett, and Al M. Gilbertson

A Historic Turquoise Jewelry Set Containing Fossilized Dentine (Odontolite) and Glass
Michael S. Krzemnicki, Franz Herzog, and Wei Zhou

The Radioactive Decay Pattern of Blue Topaz Treated by Neutron Irradiation
Jian Zhang, Taijin Lu, Manjun Wang, and Hua Chen

Every issue also includes the most up-to-date reports from the GIA Laboratory (Lab Notes) and gemologists around the world (Gem News International).

GIA students and alumni save 10% on back issues! Enter coupon code GGALUM at checkout.

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SKU: 4301101