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Drilled natural pearls examined in this study.
Saltwater Pearls from the Pre- to Early Columbian Era: A Gemological and Radiocarbon Dating Study

Examines 85 saltwater natural pearls, reportedly harvested from the Caribbean islands off the coast of Venezuela during the early 16th century, to determine their age.

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Brazilian Diamonds: A Historical and Recent Perspective

Recounts the history, geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production.

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Pearl farm on the Indonesian island of Lombok
Bead-Cultured and Non-Bead-Cultured Pearls from Lombok, Indonesia

Documents the retrieval and testing of P. maxima cultured pearls from a Lombok hatchery.

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Color bars on top and sides of 3,019 ct rough opal
The Challenges of Cutting a Large Gem Opal Rough

A first-person account of cutting a 3,019 ct piece of white opal to create a 1,040 ct gem with play-of-color across the surface.

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Underground opal mining in Koroit
Splendor in the Outback: A Visit to Australia’s Opal Fields

Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah, and Quilpie.

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The 135.74 ct Grand Sapphire
The Grand Sapphire of Louis XIV and The Ruspoli Sapphire: Historical and Gemological Discoveries

Archival research and gemological characterization reveal the true story of this 135.74 ct blue sapphire from the French crown jewels.

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Optimizing Face-Up Appearance in Colored Gemstone Faceting

How contrast patterns can increase perceived brightness and optimize a gemstone's appearance.

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Article
Colored Gemstone Value Factors

Part 1 of 5 in the series: Value Factors, Design, and Cut Quality of Colored Gemstones (Non-Diamond). This article discusses the major value factors that affect the price of a colored gemstone.

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Tourmalines
Article
Factors in Colored Stones that Interact to Affect Value

Part 4 of 5 in the series: Value Factors, Design, and Cut Quality of Colored Gemstones (Non-Diamond). This article digs deeper into cutters’ choices and explores additional factors used in the trade to assess relative value.

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Ametrine top view cut
Article
Colored Stone Cut Quality: What to Look For

Part 5 of 5 in the series “Value Factors, Design, and Cut Quality of Colored Gemstones (Non-Diamond)” explores craftsmanship’s bearing on cut quality.

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