Characteristics of Amber with Irradiation Treatment
A study of the effects of irradiation treatment on amber.
Cuprite and Malachite in Agate from the Yanyuan Region, Sichuan
Rare identification of two kinds of copper-bearing inclusions in agate from the Yanyuan region in China.
The Discovery of Davemaoite, the CaSiO3 Perovskite, in a Diamond from Earth’s Lower Mantle
Davemaoite identified in a diamond from Orapa, Botswana.
Gray “Spinel Sisters”
Two rare gray spinel stones stand out at the AGTA show for their exceptional size, quality, and color.
Inclusions and Spectroscopic Features of Yellowish Green Enstatite
Close study of six bright yellowish green enstatite samples reveals cause of color and four-rayed asterism.
Large, Rare Faceted Collector Gems
Rarely faceted colemanite and phosphophyllite of record-breaking size were on display at the AGTA show.
Many Faces of Wavellite
An Arkansas lapidarist shares his work with wavellite and explains his stabilization process.
One-of-a-Kind Designs from Zoltan David
Iconic jewelry designer Zoltan David continues on his path of exploration in metalsmithing after 42 years of creating his one-of-a-kind designs.
Sugar/Heat-Treated Opal
At the AGTA show, lapidarist James Carpenter explains his use of sugar/heat treatment to enhance opal.
Unusual Repair of a Natural Emerald
Glass identified as the raw material used to conceal damage of a natural emerald.
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