Winter 1991
- $15.00
The PDF version of this issue is available at no charge. Visit www.gia.edu
Marine Mining of Diamonds Off the West Coast of Southern Africa
John J. Gurney, Alfred A. Levinson, and H. Stuart Smith
Sunstone Labradorite from the Ponderosa Mine, Oregon
Christopher L. Johnston, Mickey E. Gunter, and Charles R. Knowles
Curves and Optics in Nontraditional Gemstone Cutting
Arthur Lee Anderson
An Examination of Nontransparent "CZ" from Russia
Robert C. Kammerling, John I. Koivula, Robert E. Kane, Emmanuel Fritsch, Sam Muhlmeister, and Shane F. McClure
1991 Annual Index
Every issue also includes the most up-to-date reports from the GIA Laboratory (Lab Notes) and gemologists around the world (Gem News International).
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