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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.

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Pipi pearls from French Polynesia
Natural Pipi Pearls from Tahiti

Olivier Segura, Emmanuel Fritsch, and Djamel Touati, April 30, 2014

An overview of natural "pipi" pearls from French Polynesia.

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Vietnamese peridot nodules, rough stones, and faceted samples
Peridot from the Central Highlands of Vietnam: Properties, Origin, and Formation

Nguyen Thi Minh Thuyet, Christoph Hauzenberger, Nguyen Ngoc Khoi, Cong Thi Diep, Chu Van Lam, Nguyen Thi Minh, Nguyen Hoang, and Tobias Häger, November 7, 2016

Analyzes the gemological and geochemical characteristics of peridot from the Gia Lai province alongside specimens from other localities to gain insight into its formation.

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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.

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Figure 2. A 0.89 ct heated orange oval brilliant sapphire. Photo by Robert Weldon; courtesy of Greenland Ruby.
Bright Orange Sapphire from Greenland

Jennifer Stone-Sundberg and Si Athena Chen, May 23, 2023

A transparent bright orange sapphire from Greenland stands out at the AGTA show in Tucson.

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A pair of earrings with unoiled emeralds weighing about 8 ct total, natural pearls measuring 9.5–10.0 mm, unheated Burmese rubies weighing just under 5 ct total, and diamonds set in yellow gold. Photo courtesy of ProVockative Gems Inc.
Spotlight on Natural Nacreous Pearls

Lisa Kennedy and Artitaya Homkrajae, May 23, 2023

Alex Vock shares his expertise on natural saltwater nacreous pearls.

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Figure 1. The Heart of Australia, a 3,510 ct double pseudomorph ikaite-calcite-opal gem specimen, is considered one of the finest ever unearthed. Courtesy of Graeme Dowton.
Rare Double Pseudomorph Ikaite-Calcite-Opal

Si Athena Chen and Jennifer Stone-Sundberg, May 23, 2023

One of the finest specimens of double pseudomorph ikaite-calcite-opal ever unearthed was on display at the Pueblo Gem & Mineral Show.

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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.

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Figure 1. A handful of gem gravel collected from the Lofa River in Weasua, Liberia, showing the high concentration of ruby material. Photo courtesy of Diamonds for Peace.
Liberian Ruby

Beth West, May 23, 2023

A trip to a rural Liberian diamond mining community results in a newly discovered source of corundum.

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Mediterranean coral from different regions. Left: Dark red fine coral from the northern coast of Sardinia. Center two pieces: “Classic” coral from the southern coast of Sardinia. Right: Orangy coral, termed “Sciacca,” from the coast of southern Sicily. Photo by Lisa Kennedy; courtesy of Fulvio Di Gennaro Srl.
Italian Precious Coral

Lisa Kennedy and Cristiano Brigida, May 23, 2023

A look at the Italian coral market and precious coral samples from the Mediterranean Sea.

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