Summer 2011

POSTER SESSION: COLORED STONE AND PEARL IDENTIFICATION

Spectral Correlation of Manganese and Iron in Tourmalines from Madagascar
Yong-Kil Ahn, Jin-Gyo Seo, and Jong-Wan Park

Chinese Freshwater Cultured Pearls with Exotic Metallic Colors
Blaire Beavers and Jeremy Shepherd

Natural Non-Nacreous Pearls from the Giant Clam Tridacna Gigas
David Bidwell, Nick DelRe, Annette Widemann, and Marina Epelboym

Application of Discriminant Analysis in Gemology: Country-of-Origin Separation in Colored Stones and Distinguishing HPHT-Treated Diamonds
Troy Blodgett and Andy Shen

Remarkable Gems Encountered at the Gem Testing Laboratory, Jaipur, India
Gagan Choudhary

Spectroscopic Examination of Commercially Available Quartz Varieties: A Gemological Perspective
Gagan Choudhary and Shyamala Fernandes

IR and UV-Vis Spectroscopy of Gem Emeralds—A Tool to Differentiate Natural and Synthetic Stones, as Well as Geographic Origin?
Katrien de Corte and Mathieu Van Meerbeeck

Extreme Conoscopy
Sylvia M. Gumpesberger

Determining the Chemical Composition of Garnets Using Raman Spectroscopy
Rachel R. Henderson, Robert T. Downs, and Jennifer La Sure

Circle and Spot Formation Mechanisms and Changes in Luster, Color, and Roundness of Cultured Pearls by Grafting Methods in Pinctada Margaritifera
Masahiro Ito

The Observation of Defects After the Pretreatment and Simple Heat Treatment of Ruby
Bo-Hyun Lee, Kyeung-Moon Choi, Young-Chool Kim, and Seog-Joo Yon

Operational Considerations of EDXRF, LA-ICP-MS, and Photoluminescence Techniques in the Analysis of Pearls
Ren Lu, Chun-Hui Zhou, and Nicholas Sturman

Experiments on Ancient Gem Treatment Techniques
Cigdem Lule

A Gemological Comparison of the Two Major Oregon Sunstone Deposits
Shane F. McClure

Changes in Color and Optical Properties of Various Sapphires by Electron-Beam Irradiation
Jin Gyo Seo, Kyung Yeon Kim, Yong Kil Ahn, and Jong Wan Park

The GIA Gem Project—An Online Resource of Information on Gemstones
James E. Shigley, Brooke Goedert, and Terri L. Ottaway

Spectroscopic Characteristics of Some Gem Tourmalines
Boontawee Sriprasert

New Artificially Asteriated Gemstones
Martin P. Steinbach

Experiments on Heating of Blue Sapphires with Beryllium
Pornsawat Wathanakul, Wiwat Wongkokua, Thanapong Lhuaamporn, Monruedee Tawornmongkolkij, Thanong Leelawatanasuk, Wilawan Atichat, Visut Pisutha-Arnond, Chakkaphan Sutthirat, and Boontawee Sriprasert

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