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.

This article reports on a detailed gemological examination of this new synthetic cat's-eye alexandrite.

Researchers of the Tairus joint venture have developed the technology for the hydrothermal growth of gem-quality crystals of synthetic sapphire.

A cluster of bladed columbite crystals is identified in colorless topaz.

A GIA student from the London campus receives recognition for a necklace design featuring baroque pearls, diamonds, and light pink garnets.

Strong linear brown zoning is observed in a Fancy Dark yellow-brown diamond.

An iridescent partially healed fissure is observed in a blue sapphire from Sri Lanka.

The author has uncovered many ancient references to the simulation or enhancement of gemstones.

A useful way to identify stones that contain no distinguishing inclusions.

Over the last decade, Pakistan has developed into an important source for many gem materials. A number of localities have been identified for emeralds in particular.

With the withdrawal of Soviet troops from Afghanistan, villagers in the Panjshir Valley are turning their attention to the emerald riches of the nearby Hindu Kush Mountains.

The Anahí mine in southeastern Bolivia has enjoyed consistent production since 1990 and is best known for its ametrine.

Gem Testing lab in Jaipur, India recently examined a white-brown, translucent to opaque oval cabochon that turned out to be a composite featuring an unusual combination of gem materials.

Reif（赖夫）先生参加图森宝石展，推广其矿场的产品：“现有最稀少的宝石之一”浓绿榴石柘榴石。