The New York lab recently identified a sapphire entirely covered with a cobalt coating to enhance its blue color.

A remarkable inclusion scene in diamond is showcased by an unconventional cutting style.

Resin materials marketed as imitation ivory were recently acquired by a GIA gemologist.

The Hong Kong laboratory recently examined a 14.36 ct pink-orange cushion mixed-cut specimen.

An intriguing item was sent by KC Bell to GIA’s Carlsbad laboratory for examination.

Quartz crystals with three-phase fluid inclusions from the Jinkouhe mine in the Sichuan Province of China have been sold for many years at gem and mineral shows such as those held annually in Tucson, Arizona.

At the GIA Carlsbad laboratory, the authors recently examined a cabochon of “bloodshot” iolite (containing red, eye-visible platelets of hematite) intergrown with a sunstone.

LA-ICP-MS analysis helps researchers better understand the composition of this type of spinel from Nigeria.

An eye-visible cloud with a star-like pattern is highlighted by the cut of the Rare Sun diamond.

Recently, a 2.05 ct blue sapphire was sent to Guild Gem Laboratories for identification.

Artificial glass, a low-cost material, is capable of simulating any gemstone owing to its range of appearances (bodycolor, transparency, and phenomena).

The DANAT laboratory recently encountered two natural black color beads cut from an unknown mollusk.

The 2019 AGTA show in Tucson featured the work of a gemstone portrait artist.

Nigerian aquamarine with exceptionally deep and saturated color also displays unusually strong pleochroism.

An edible oyster from the Hab River Delta of Pakistan reveals a natural pearl.

Minute platy magnetite inclusions in these emeralds from Pakistan could help advance our understanding of trapiche.

Identifies mineral inclusions in corundum from this locality for comparison with other global deposits.

Examines a new rhodochrosite simulant composed of pressed gibbsite and calcite powder.