Colombian Trapiche Emeralds: Recent Advances in Understanding Their Formation
Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.
Trapiche and More...
Colombia’s unique trapiche emeralds exert a fascination for many gemologists.
The Beauty and Value of Inclusions, Plus Double Stars and Corundum from Tajikistan
We invite gemologists to take a closer look at the astounding beauty and variety of the micro-world of gems.
The Wittelsbach-Graff and Hope Diamonds: Not Cut from the Same Rough
Two historic blue diamonds, the Hope and the Wittelsbach-Graff, appeared together for the first time at the Smithsonian Institution in 2010.
Pseudo-Synthetic Growth Structure Observed in Natural Diamond
This stone was a good example of a very rare natural diamond exhibiting synthetic growth characteristics.
Zoned Scapolite from India
This contributor encountered parcels of rough and faceted scapolite that appeared strongly zoned to the unaided eye.
Rare Double-trapiche Emerald
At the AGTA show, Equatorian Imports showed this contributor two pieces of emerald with a very rare double-trapiche pattern
Summer 2003 G&G Book Reviews
“Krystallos—Brazil: Gem-Crystals in Design”; “The Fabergé Menagerie”; “The Great Book of Amber”; “The Rings Book”; “The Ultimate Orient: Philippine South Sea Pearls”
Gem-Quality Synthetic Diamonds Grown by a Chemical Vapor Deposition (CVD) Method
Brown-to-gray and near-colorless single-crystal type IIa synthetic diamonds grown.
Diopside Needles as Inclusions in Demantoid Garnet from Russia: A Raman Microspectrometric Study
Straight, acicular, colorless solid inclusions in demantoid garnet from the Ural Mountains of Russia were investigated by laser Raman microspectrometry.