Cobalt is identified as the primary coloring agent in an intense blue specimen of gahnospinel at GIA’s Bangkok laboratory.

A large specimen of extraterrestrial peridot is analyzed at the Carlsbad laboratory.

Aegirine inclusions are observed in two samples of poudretteite from Mogok.

A report from the 37th IGC, held in late October 2023 in Tokyo.

Large blue and pink diamonds were among the top lots of the fall auction season, including the most expensive auction jewel of 2023.

Several G&G contributors are recognized for their work on the latest volume in the Reviews in Mineralogy & Geochemistry series.

The Antwerp lab examines CVD laboratory-grown diamonds where HPHT processing resulted in relatively low color grades.

Examination of a brown peridot xenocryst reveals thread-like serpentine inclusions resembling ancient text.

Synthetic moissanite is much closer to diamond in overall appearance and heft than any previous diamond imitation; this article reports on how to identify and characterize it.

Suggested Reading on Sapphires and their Inclusions

Synthesized gem-quality diamonds from the General Electric Company are analyzed for characteristics that distinguish them from natural stones.

A sphere of Armenian turquoise with natural brown matrix material mimics planet Earth.

One-of-a-kind gemstone keycaps for mechanical keyboards were exhibited at the 22nd Street show.

Elongated zircon inclusions display attractive birefringent interference colors in a blue sapphire from Kashmir.

在同一块宝石中同时拥有紫水晶和黄水晶成色的透明、双色石英即紫黄晶或紫水晶-黄水晶。

了解玉须具备的要素。

Several lots sold during the spring auction season far exceeded their presale estimates.

An in-depth look at Clarity Diamond’s CVD facility in Austin, Texas.

A large baroque-shaped blister pearl with a unique multicolored appearance is examined in the Mumbai laboratory.