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.

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

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

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

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

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.

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).

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

Long-forgotten opals found after 27 years in storage still looked stable and ready to be worked.

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

Determines methods for maximizing production and quality of cultured half-pearls.

Spectroscopic and chemical analyses of emeralds from this Chinese deposit show a unique composition.

A look at the gem ornamentation of this landmark, as well as the jewels of the Mughal dynasty.

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

Reveals the process for hydrothermal enhancement of amber and the means of detection.

Characterization of an intense yellowish green faceted diamond revealed a complex treatment process.

A systematic study of the properties of approximately 500 Fancy white and 1,200 Fancy black diamonds.

这一系列珠宝图片说明了金属加工技术如何展示宝石和珠宝设计。