Article Search Results

Types

Articles (250)

Content Type

Lab Notes (5) Gem News International (29) Reviews (1) Abstract (14) Feature (21)

Reviewed

Peer Reviewed (84)

Topics

See All Topics

Gemstones

Sapphire (61) Diamond (50) Ruby (47) Emerald (42) Pearl (12) See All Gemstones

XClear Selections

Large sunstone rough from the Ponderosa mine in Oregon

Ponderosa Sunstone Update

Duncan Pay, May 11, 2018

John Woodmark provides an update on the Ponderosa sunstone mine in Oregon.

Faceted peridot from the Pyaung-Gaung mine in Mogok

Gemological Characterization of Peridot from Pyaung-Gaung in Mogok, Myanmar

Montira Seneewong-Na-Ayutthaya, Wassana Chongraktrakul, and Tasnara Sripoonjan, January 28, 2022

Examines the mining and the internal, spectroscopic, and chemical features of peridot from this deposit, which possesses a rich olive green color and is available in large sizes.

A 7.94 ct rectangular step-cut rhodochrosite from the Sweet Home mine in Colorado’s Alma Mining District. Photo by Robert Weldon; courtesy of Barker & Co.

Sweet Home Mine Rhodochrosite from 1888

Erin Hogarth, May 23, 2023

A rhodochrosite on display at AGTA dates back more than a century to Colorado’s Alma Mining District.

Figure 1. A 16.96 ct emerald-cut green tourmaline from rough found near a new pocket at the Tourmaline King mine. Photo by Robert Weldon; courtesy of Pala International.

New Tourmaline Pockets in San Diego County’s Pala District

Erin Hogarth, May 23, 2023

Bill and Carl Larson share details about new tourmaline pocket discoveries at the Tourmaline King mine.

The GIA Library’s award-winning exhibit on mercury-free mining at the Tucson Gem and Mineral Show. Photo by Chris Rogers.

GIA Library Wins Exhibit Award at TGMS

Erica Zaidman, May 23, 2023

GIA’s Richard T. Liddicoat Gemological Library and Information Center wins award for exhibit highlighting mercury-free gold mining at TGMS.

Figure 1. Some of Virtu Gem’s larger gemstones from Kenya, Malawi, and Zambia at the Ethical Gem Fair. Clockwise from top: 45.00 ct citrine, 32.33 ct rutilated quartz, 9.80 ct aquamarine, 21.65 ct citrine, 9.99 ct aquamarine, 12.32 ct aquamarine, 17.20 ct aquamarine, and 20.15 ct citrine (center). Photo by Robert Weldon; courtesy of Virtu Gem.

Ethical Supply Chain Practices in Africa with Virtu Gem

Erin Hogarth, May 23, 2023

A look at Virtu Gem, a company dedicated to improving artisanal mining practices in Africa.

Gem Rhodochrosite from the Sweet Home Mine, Colorado

Kimberly Knox and Bryan K. Lees, June 1, 1997

New mining techniques have combined state-of-the-art equipment and technology to detect and extract large, fine-quality rhodochrosite specimens and gem rough.

Outlook on Opals from Mexico and Australia

Duncan Pay and Jennifer-Lynn Archuleta, May 11, 2018

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

Russian demantoids with pure color and horsetail inclusions

Update on Russian Demantoid Production

Wim Vertriest, May 11, 2018

Alexey Burlakov shares insights on the current production of Russian demantoid and emeralds.

The Rubies of Burma: A Review of the Mogok Stone Tract

Peter C. Keller, December 1, 1983

A review of the history of this area, its geology, and the mining methods that have predominated.

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Gemstones

Find a Retailer

Shop the Campus Store

Subscribe to Knowledge Rocks Emails

Learn About Diamond Origin Reports