Article Search Results

Show Filters
Showing 54 results for "*"
Colombian Trapiche Emeralds: Recent Advances in Understanding Their Formation

Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.

Read More

Duncan Pay
Trapiche and More...

Colombia’s unique trapiche emeralds exert a fascination for many gemologists.

Read More

Duncan Pay
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.

Read More

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.

Read More

DiamondView Imaging of the Pavilion Facets
Pseudo-Synthetic Growth Structure Observed in Natural Diamond

This stone was a good example of a very rare natural diamond exhibiting synthetic growth characteristics.

Read More

147429
Zoned Scapolite from India

This contributor encountered parcels of rough and faceted scapolite that appeared strongly zoned to the unaided eye.

Read More

145954
Rare Double-trapiche Emerald

At the AGTA show, Equatorian Imports showed this contributor two pieces of emerald with a very rare double-trapiche pattern

Read More

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”

Read More

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.

Read More

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.

Read More