Current Issue

Winter 2011

Volume 47, Issue 4

Purchase this issue or the feature articles.

Great Expectations
Jan Iverson

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

REGULAR FEATURES
Lab Notes (Featuring: Type IIb Diamond with Long Phosphorescence)
Gem News International (Featuring: Vanadium-Bearing Color-Change Sphene from Pakistan/Afghanistan)
Book Reviews
Gemological Abstracts
Annual Index

Issues of Gems & Gemology may be purchased individually, or save by buying one-, three-, or five-year sets. To place an order, visit the GIA Store or contact the Circulation Coordinator: 800-421-7250, ext. 7142. Outside the U.S., email or call 760-603-4000, ext. 7142.