Colour-Change Garnet in Diamond
This diamond contained an inclusion of pyrope-spessartine garnet that appeared greyish green in fluorescent light and purplish red in incandescent light.
Unusual Dumbbell-Like Inclusion in Diamond
Examination of a 0.40 ct near-colourless round brilliant diamond with a large inclusion resembling a dumbbell
Bright yellow diamonds from Sierra Leone
Examination of strongly yellow diamonds from the Zimmi area of Sierra Leone revealed graphitised feather inclusions.
Undisclosed Samples of Large CVD Synthetic Diamond
In mid-2012, one of the international diamond grading laboratories in Antwerp reported undisclosed CVD synthetic diamonds, causing a stir in the diamond industry.
Boron Carbide: A New Imitation of Black Diamond
The Gem Testing Laboratory in Jaipur identified a black diamond-like specimen as boron carbide, a ceramic material typically used in nuclear, military, and aerospace applications.
Demantoid garnet fossil pseudomorphs
In these two extremely rare specimens, demantoid garnet has replaced coral and gastropod fossils.