Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section
G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.
“Fluorescence Cage”: Visual Identification of HPHT-Treated Type I Diamonds
HPHT-treated type I diamonds of various colors may exhibit unusually intense fluorescence at the facet edges and junctions.
Contribution to the Identification of Treated Colored Diamonds: Diamonds with Peculiar Color-Zoned Pavilions
Some treated yellow and blue-to-green diamonds show a peculiar color zoning when viewed through the pavilion.
Treated-Color Pink-To-Red Diamonds from Lucent Diamonds Inc.
Using a multi-step process, Lucent Diamonds has developed a new treatment process for certain natural diamonds that creates colors from pink-purple through red to orangy brown.