Unusual Absorption in a Blue Flux-Grown Synthetic Sapphire
The Bangkok lab identified unexpected characteristics in a flux-grown synthetic sapphire.
Large Type IIa Diamond from Arkansas, USA
The GIA lab in Carlsbad recently had the opportunity to examine a truly “all-American” diamond.
Largest CVD Laboratory-Grown Diamond Submitted to GIA
Progress in creating laboratory-grown CVD diamonds allows for larger sizes, including the largest yet seen at the Carlsbad lab.
Artificial Glass Imitating a Paraíba Tourmaline
A creative imitation using fused bluish green glass with copper platelets poses as Paraíba tourmaline.
Chromite Inclusions in Green Common Opal
Black opaque octahedral inclusions with yellow staining confirm the presence of chromite inclusions in an interesting common opal.
Irradiated Blue Diamond
Color engineering with artificial irradiation turns a pinkish purple Argyle diamond light blue.
Blue “Graining” in Green-Yellow Diamond
Unusual color zoning likely indicates multiple treatments of a Fancy Intense green-yellow diamond.
Rare Intense Purplish Pink Montana Sapphire
A Montana sapphire of unusual size and color proves to be from the secondary deposit of Rock Creek.