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Figure 1. Weighing 20.57 ct and measuring 37.10 mm in length, this doubly terminated, heavily etched spodumene crystal contains chromium as its coloring agent or chromophore. Photo by Adriana Robinson.

Quarterly Crystal: Hiddenite from Idaho

John Koivula, Nathan Renfro, and Maxwell Hain, January 26, 2024

Sail-shaped etch features provide proof that a sample sold as aquamarine is actually a spodumene crystal.

Heitor Barbosa discovered Paraíba tourmaline in 1989 after almost a decade of mining. Photo by Duncan Pay.

In Memoriam: Heitor Barbosa

GIA Staff, January 26, 2024

The life of the discoverer of Paraíba tourmaline is remembered.

A crystal inclusion in red spinel shown in darkfield illumination (left) and fiber-optic lighting (right). Photomicrographs by Isabelle Corvin; field of view 1.78 mm.

Suspended Crystal in Red Spinel

Isabelle Corvin, January 26, 2024

A crystal inclusion in red spinel displays rainbow colors under fiber-optic lighting.

Laura Mae, Amanda Jean, and Ilan Portugali are some of GIA’s featured graduates on the Alumni Collective website.

GIA Alumni Collective

GIA Staff, January 26, 2024

The Alumni Collective celebrates GIA alums from all over the world.

Diamond: Genesis, Mineralogy and Geochemistry, Volume 88 in the Reviews in Mineralogy and Geochemistry series, received this year’s Mary B. Ansari Best Geoscience Research Resource Award.

G&G Contributors Awarded for Best Geoscience Research

GIA Staff, January 26, 2024

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

A view through the table of a padparadscha sapphire displayed this jagged suspended crystal, likely a metal sulfide, featuring a rare texture. Photomicrograph by Courtney Robb; field of view 2.90 mm.

Spiky Inclusion in Padparadscha Sapphire

Courtney Robb, January 26, 2024

An inclusion with a metallic luster is observed in a pinkish orange padparadscha sapphire.

37th International Gemmological Conference

Ahmadjan Abduriyim, January 26, 2024

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

Figure 1. A rock crystal pendant measuring 48.5 × 31.2 × 8.8 mm with a white cross inclusion. Photo by Tsung-Ying Yang.

Rock Crystal with Cross Inclusion Exhibiting Brownian Motion

Shu-Hong Lin, Tsung-Ying Yang, Kai-Yun Huang, and Yu-Shan Chou, January 26, 2024

Numerous two-phase inclusions form a cross in a rock crystal pendant.

Figure 1. A rare 1.04 ct semitransparent thomsonite measuring 7.53 × 6.15 × 4.67 mm. Photo by Adriana Robinson.

Rare Faceted Thomsonite

Michaela Damba, January 26, 2024

A colorless semitransparent thomsonite is examined in the Carlsbad laboratory.

A pseudo-icosahedral crystal of pyrite in a 2.88 ct Colombian emerald. Photomicrograph by Taku Okada; field of view 1.01 mm.

Pseudo-Icosahedral Pyrite in Colombian Emerald

Taku Okada, January 26, 2024

A 2.88 ct Colombian emerald plays host to a metallic yellow pyrite crystal.

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