An unusual hematite crystal from Pakistan hosts a geometric outer skin of sagenitic rutile.

Pink faceted tourmaline reveals unique colorless windmill-shaped zoning.

The American Gem Society (AGS) announces two events for 2021: Confluence in April and Conclave in September.

Spectroscopic techniques prove key in separating resin-based imitation ivory from natural ivory.

Unique dendritic inclusions containing penninite may be a key indicator of origin for Dahua nephrite.

Testing reveals interesting inclusions in Chinese emeralds to be calcite and dolomite.

Small cracks from laser engraving reveal the origin of these phantom quartz imitations.

The production of Chinese freshwater pearls faced little disruption from the global pandemic according to sources at the World Pearl Congress.

Unusual color zoning likely indicates multiple treatments of a Fancy Intense green-yellow diamond.

A Montana sapphire of unusual size and color proves to be from the secondary deposit of Rock Creek.

Very similar inclusion scenes featuring needles and thin films make rubies from Kenya hard to distinguish from Mogok rubies.

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.