◂ BACK TO GEM ENCYCLOPEDIA
FANCY COLOR DIAMOND
Dazzling brilliance. Captivating color. The planet’s most valued gems are fancy color diamonds.
See Gem As
Tools
Research
Visible Absorption Spectra of Colored Diamonds
Features a foldout chart containing representative visible spectra and photos of the major color categories of diamond.
Gemstones and Jewelry Inspired By Nature
At AGTA, exquisite jewelry pieces inspired by natural scenes were on view.
Record Prices at Gem Auctions
Auction price records were broken in late 2014 as ultra-wealthy buyers vied for rare, important gemstones.
CVD Synthetic Diamond with Fancy Vivid Orange Color
Strong absorptions from N-V centers were the main cause of a CVD synthetic diamond’s pinkish orange bodycolor.
Xenotime Inclusion in Yellow Diamond
Presents what is believed to be the first report of a xenotime inclusion in gem-quality diamond.
Heavily Irradiated CVD Synthetic Diamond
A look at the first CVD synthetic diamond examined at GIA that has been irradiated to a blue color.
Colored Diamonds: A Colorful Anniversary
The GIA Colored Grading Diamond System is the method by which colored diamonds are graded. It’s been so successful, that GIA has been entrusted with grading virtually every important colored diamond that has gone to auction.
From a Snowflake to an Iceberg: The McFerrin Collection
Diamond with Unusual Laser Manufacturing Remnant
An unusual laser manufacturing remnant, possibly once used to guide a gem cutter, was left behind in a clock-like shape.
Optical Defects in Diamond: A Quick Reference Chart
A simple chart on optical defects in diamond, including those that produce coloration and fluorescence colors.
Fluorescence Produced by Optical Defects in Diamond
How variations in UV lamp output can affect observed fluorescence color and intensity.
Fish-Like Inclusion in Fancy Yellow
A recent lab examination at GIA New York revealed an inclusion in a rectangular Fancy Yellow called "pareidolia," which means it was a resemblance of the scales and form of a fish.
