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Aquamarine with Zigzag Growth Line Inclusions
Fossilized Shell Consisting of Emerald
Zircon with Unusual Color-Change Behavior
The Carlsbad laboratory recently had the chance to examine a 4.60 ct cushion-cut zircon with truly unusual color behavior.
Translucent Ruby Filled with Zinc Glass
Gemological Characteristics of Low-Temperature “Gel-Filled” Turquoise
Hydrothermally Grown Synthetic Aquamarine Manufactured in Novosibirsk, USSR
Cat’s-Eye Nephrite Jade from Washington State
Cat’s-eye nephrite jade from Washington State. Washington Jade (Edmonds, Washington) made its Tucson debut at the AGTA show with nephrite jade from Washington State.
Purple Gem Spinel from Vietnam and Afghanistan: Comparison of Trace Element Chemistry, Cause of Color, and Inclusions
Figure 1. The vivid colors seen in fine gem-quality spinel are derived from the mixing between multiple different chromophores in a range of ratios and concentrations, as in this fine 13.52 ct violetish purple spinel. Courtesy of the Dr. Edward J. Gübelin Collection. Photo by Robert Weldon/GIA.
Iolite-Sunstone Intergrowth and Inclusions
At the GIA Carlsbad laboratory, the authors recently examined a cabochon of “bloodshot” iolite (containing red, eye-visible platelets of hematite) intergrown with a sunstone.
Hidden Gems at the San Diego Natural History Museum
Each level of the vertical Hidden Gems exhibit offers a different theme at the San Diego Natural History Museum.
Separating Glass-Filled Rubies Using the DiamondView
The DiamondView instrument is able to identify glass as the filler in a pair of heart-shaped rubies.
Iolite from the Thor-Odin Dome, British Columbia, Canada: Geology, Chemical Composition, Inclusions, and Cause of Chatoyancy
Reports on the geological setting and gemological properties of violet-blue gem cordierite from new deposits located in British Columbia.