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A model holds a large cut-corner square diamond with three fingers.
Article
De Beers Ups Supply; US Federal Trade Commission Warns About ‘Eco’ Claims

DeBeers responds to fluctuations, and the FTC issues warnings on laboratory-grown diamonds. Plus: 302.37 ct Graff Lesedi La Rona is revealed.

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

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

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Article
Coloured Gemstone Value Factors

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

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Tourmalines
Article
Factors in Coloured Stones that Interact to Affect Value

Part 4 of 5 in the series: Value Factors, Design, and Cut Quality of Coloured 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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Firefighter Memorial
Article
Gem Cutting Styles - Definitions

Part 2 of 5 in the series: Value Factors, Design, and Cut Quality of Coloured Gemstones (Non-Diamond). This article establishes a common language for discussing cutting styles, with a focus on basic faceting styles, and offers a short discussion on cabochons and beads

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Kunzite top and side view
Article
Coloured Stone Darkness & Brightness

Part 3 of 5 in the series: Value Factors, Design, and Cut Quality of Coloured Gemstones (Non-Diamond). This article examines how cutting decisions can have a profound affect on a gemstone’s colour quality.

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Article
Diamond Cut: The Wow Factor

Learn the basics of the GIA Cut Grading System for round brilliant cut diamonds to help pick out your perfect diamond.

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Drilled natural pearls examined in this study.
Saltwater Pearls from the Pre- to Early Columbian Era: A Gemmological 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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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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Underground opal mining in Koroit
Splendour 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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