Mixed-Type Cape Diamond
A Fancy orangy yellow “cape” diamond featured an unexpected 480 nm band, a defect normally associated with orange color.
Diamond with High Concentration of Nickel
Analysis of Fancy Light greenish yellow diamond leads to detection of nickel, as well as an inclusion that gives a color-change effect.
Spring 2015 G&G Examines Blue Spinel, Chinese Jewelry Design and the Latest in Synthetics
G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.
Buff-Top Round Diamond
The New York lab recently examined several diamonds with an interesting variation on the cabochon.
An opal featuring a rare six-rayed star is examined in GIA's Bangkok lab.