Snowflakes in Opal
History of Emerald Mining in the Habachtal Deposit of Austria, Part II
The finale of a two-part series on the mining history of Austrian emerald deposits in the Habachtal region.
Spring 1991 G&G Lab Notes
“Bubble Obsidian” from Armenia
Splendors from the Deep: Historic Treasures from a Spanish Shipwreck
Demantoid and Topazolite from Antetezambato, Northern Madagascar: Review and New Data
An important deposit of andradite, containing demantoid and topazolite varieties, has been mined near the village of Antetezambato in northern Madagascar since early 2009.
Trapiche Garnet from Vietnam
A rare occurrence of 14 trapiche patterns is observed in a garnet sample from Vietnam.
Tsavorite and Other Grossulars from Itrafo, Madagascar
Since 2002, tsavorite and other grossular varieties have been recovered from a primary deposit at Itrafo, a village in the Andrembesoa area of central Madagascar.
Spiral Patterns on a Non-Nacreous Pearl
An Update on Color in Gems. Part 3: Colors Caused by Band Gaps and Physical Phenomena
The final part of this series is concerned with colors explained by band theory, such as canary yellow diamonds, or by physical optics, such as play-of-color in opal.
A Unique Omphacite Jade Pendant
YNY Jewels: Designer Surbhi Pandya
Handcrafted jewelry pieces featuring tanzanite carvings stood out at the GJX show.