Summer 2010

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

The Wittelsbach-Graff and Hope Diamonds: Not Cut from the Same Rough
Eloise Gaillou, Wuyi Wang, Jeffrey E. Post, John M. King, James E. Butler, Alan T. Collins, and Thomas M. Moses

Play-of-Color Opal from Wegel Tena, Wollo Province, Ethiopia
Benjamin Rondeau, Emmanuel Fritsch, Francesco Mazzero, Jean-Pierre Gauthier, Benedicte Cenki-Tok, Eyassu Bekele, and Eloise Gaillou

A New Type of Composite Turquoise
Gagan Choudhary

New Occurrence of Fire Opal from Bemia, Madagascar
Martina Simoni, Franca Caucia, Ilaria Adamo, and Pietro Galinetto

X-ray Computed Microtomography Applied to Pearls: Methodology, Advantages, and Limitations
Stefanos Karampelas, J¸rgen Michel, Mingling Zheng-Cui, Jens-Oliver Schwarz, Frieder Enzmann, Emmanuel Fritsch, Leon Leu, and Michael S. Krzemnicki

X-ray Computed Microtomography: Distinguishing Natural Pearls from Beaded and Non-Beaded Cultured Pearls
Michael S. Krzemnicki, Sebastian D. Friess, Pascal Chalus, Henry A. Hanni, and Stefanos Karampelas

Hibonite: A New Gem Mineral
Thomas Hainschwang, Franck Notari, Laurent Massi, Thomas Armbruster, Benjamin Rondeau, Emmanuel Fritsch, and Mariko Nagashima

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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SKU: 4301003