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Tools
Research
Pitfalls in Color Grading Diamonds by Machine
Two major sources of error make spectroscopically determined color grades unreliable.
Kaleidoscope of Butterflies and Tiny Fish in Diamonds
Feather inclusions observed in two natural diamonds evoke scenes in nature.
Mask Inhabiting a Natural Diamond
The mirror image of a feather inclusion in a natural diamond resembles a theater mask.
Hematite Crystals in Diamond
Tiny hematite crystal inclusions identified along two fractures in natural diamond.
CVD Synthetic Diamond with Unstable Color Centers
CVD-Grown Diamond with Few Diagnostic Features
A CVD-grown diamond submitted to GIA requires very careful examination to determine its origin.
Natural Diamond with Unusual Phosphorescence
A rare observation of spatially distinct red and greenish blue phosphorescence in a natural diamond.
Natural Type IIa Diamond with Unusual Red Fluorescence Distribution
Breyite in Diamond
Iridescent Inclusion in Brown Diamond
An iridescent crystal with a stress halo is observed in a light brown diamond.
Natural Diamond with Twinning Wisps Resembling a Whale
Examination of a round brilliant diamond reveals twinning wisps in the formation of a whale.
Diamond Inclusions “Watching a Fly”
Crystal inclusions in a natural diamond resemble a unique scene.
