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FANCY COLOR DIAMOND
Dazzling brilliance. Captivating color. The planet’s most valued gems are fancy color diamonds.
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Research
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.
Characterization and Grading of Natural-Color Yellow Diamonds
A large number of natural-color yellow diamonds are analyzed using grading and appearance aspects among other characteristics to clarify the differences between them and the light yellow diamonds associated with GIA's D-to-Z color grading scale.
Large Treated-Color CVD Laboratory-Grown Diamond Rings
Testing of five CVD laboratory-grown diamonds submitted to the New York laboratory reveals post-growth treatment to achieve fancy colors.
Very Large Type Ib Natural Diamond
A 13.09 ct. Fancy yellow rough diamond, with C centers causing the intense color, is seen in the New York lab.
Separation of Black Diamond from NPD Synthetic Diamond
Legal Protection for Proprietary Diamond Cuts
Considerable confusion exists in the trade about the important differences between trademarks and patents.
The Grass Is Always Greener…
The Carlsbad laboratory reports on a Fancy grayish green diamond with radiation stains resembling blades of grass.
Coesite Inclusions with Filaments in Diamond
Inclusions with unusual formation are found in a treated Fancy Vivid yellow diamond.
Decay Kinetics of Boron-Related Peak in IR Absorption of Natural Diamond
The decay of the transient 2800 cm–1 absorption peak in a Fancy gray diamond is observed.
Bright Yellow Diamonds from Sierra Leone
Examination of strongly yellow diamonds from the Zimmi area of Sierra Leone revealed graphitized feather inclusions.
Black Diamond with Unusual Color Origin
This black diamond's color was produced by natural radiation stains, an unusual cause of color.
Large Synthetic Moissanite with Silicon Carbide Polytypes
Examination of the properties of a synthetic moissanite specimen submitted as a black diamond.
