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Winter 1991, Volume 27, Issue 4

EDITORIAL

Buyer Beware! p.205

FEATURE ARTICLES

Marine Mining of Diamonds Off the West Coast of Southern Africa p.206-p.219
John J. Gurney, Alfred A. Levinson, and H. Stuart Smith
Sunstone Labradorite from the Ponderosa Mine, Oregon p.220-p.233
Christopher L. Johnston, Mickey E. Gunter, and Charles R. Knowles

NOTES AND NEW TECHNIQUES

Curves and Optics in Nontraditional Gemstone Cutting p.234-p.239
Arthur Lee Anderson
An Examination of Nontransparent "CZ" from Russia p.240-p.246
Robert C. Kammerling, John I. Koivula, Robert E. Kane, Emmanuel Fritsch, Sam Muhlmeister, and Shane F. McClure

REGULAR FEATURES

Gem Trade Lab Notes p.248-p.253
Gem News p.254-p.265
Book Reviews p.266-p.267

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