Research Article Search Results
The Type IIb De Beers Cullinan Blue Diamond
GIA’s New York laboratory reports on a 15.10 ct Fancy Vivid blue cut-cornered rectangular step cut named the De Beers Cullinan Blue diamond.
Inclusions in Gemstones
This installment of “Colored Stones Unearthed” explores inclusions in gems—how they form, how they are studied, and what they mean for gemologists and geoscientists.
Characteristics of Newly Discovered Amber from Phu Quoc, Vietnam
Offers the first detailed summary of amber from the Vietnamese island of Phu Quoc and a comparison with Baltic, Dominican, and Burmese material.
Brilliance Exhibit at the Natural History Museum of Los Angeles County
A glimpse at the rare gems recently on display at the Natural History Museum of Los Angeles County’s Brilliance: The Art and Science of Rare Jewels exhibit.
A Large Aquamarine with Unusual Etch Features from Xinjiang, China
Unique natural etch pattern and dissolution cavities are observed in a large aquamarine crystal.
Extraterrestrial-Like Inclusion in Mozambique Ruby
A 3.03 ct stone submitted to GIA’s Bangkok laboratory was identified as a ruby from Mozambique with no indication of heating.
Rare Blue Apatite Inclusion in Smoky Quartz
A very light blue hexagonal apatite inclusion is observed in natural smoky quartz.
Blue Sapphire Lord of the Rings Pendant
Yellow Topaz from Germany, Emerald Mining in Austria’s Habachtal Region, a Return to Tucson, and More…
Mercury Free Mining Pilot Program
Stephen M. Avery: Celebrating Half a Century in Gem Cutting
Approaching his 50th anniversary in the business, Stephen M. Avery (Lakewood, Colorado) reflected on his journey to becoming an award-winning lapidary artist, detailing his signature cuts and gem sets and offering advice to up-and-coming gemstone cutters.
Complex Fluid Inclusion in Topaz
A blue topaz recently examined by the authors contained an interesting and complex fluid-filled negative crystal that revealed some remarkable behavior when cooled down.
