A report on turquoise from the only known U.S. deposit outside of the Southwest.

A selection of very small akoya cultured specimens demonstrates the challenges gemologists face when determining pearl origin.

Jürgen Schütz discussed the opal sourcing and cutting activities of the German firm Emil Weis.

Luis Gabriel Angarita and Edwin Molina share their experiences and perspective on the Colombian emerald industry.

Fran Mastoloni shares his thoughts on the status of the cultured pearl market.

Marcelo Ribeiro offers an update on mining and cutting activities at the Belmont emerald mine in Brazil.

Rex Guo describes how he sources and systematically recuts faceted stones to unlock their inner beauty.

Jean Claude Michelou shares his perspective on supply chain transparency and beneficiation in source countries.

Margit Thorndal of Madagascar Imports offers her perspective on the colored stone market.

Stephan Reif explains the mine-to-market approach at the largest continuously operating demantoid deposit.

A bright green chromium diopside inclusion is seen in a diamond from South Africa's Kimberley mine.

Rare dissolution etch channels are seen in a natural diamond.

Two yellow sapphires yield surprising green inclusions.

The GIA lab examines five gem-quality CVD-grown diamonds in sizes that reflect the improving technology of the synthetic gemstone industry.

An HPHT-treated round brilliant diamond with an inscription that presents as a GIA report number is found to be inconsistent with the institute's report, previously issued for an untreated diamond.

The examination of two unusual garnets results in identifications issued for the first time in GIA's colored stone report records.

The material used to fill a large fracture in a diamond yields an unexpected iridescence under two different illuminations.

Characterizes diamonds with exceptionally rare natural green color, based on GIA’s extensive database of samples.

Analyzes the substructures that cause the intense iridescence observed in “rainbow” hematite from Minas Gerais, Brazil.

Shows how genetic material extracted from small amounts of pearl powder can be a useful indicator of this akoya cultured pearl species.