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Synthetic Moissanite: A New Diamond Substitute

Synthetic moissanite is much closer to diamond in overall appearance and heft than any previous diamond imitation; this article reports on how to identify and characterize it.

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Natural Diamond
A Chart for the Separation of Natural and Synthetic Diamonds

Exploration of a chart designed to give jewelers and gemologists a practical guide to identifying synthetic diamonds as they enter the jewelry trade.

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0.20-ct Diamond
A Visual Guide to the Identification of Filled Diamonds

This article illustrates the various features in filled diamonds and explores the best techniques for examining them.

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An Update on Filled Diamonds: Identification and Durability

This report focuses on recent products from Yehuda/Diascience, Koss & Schecter Diamonds (Genesis II), and Clarity Enhanced Diamond House (a subsidiary of Goldman Oved Diamond Co.).

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Diamonds Protrude from Broken Eclogite Xenolith
Age, Origin, and Emplacement of Diamonds: Scientific Advances in the Last Decade

Although certain concepts about the age and formation of diamonds have been known for some time, this overview of advances over the decade leading up to the early 1990s have expanded the scientific understanding of this fascinating topic exponentially.

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The Characteristics and Identification of Filled Diamonds

This article reports on the study of six diamonds, both before and after a filling treatment, and the examination of 12 additional filled stones.

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Characterization and Grading of Natural-Color Pink Diamonds

Known for their great beauty and rarity, pink diamonds have long been sought after by jewelers, collectors, and consumers.

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10 Study Samples Before and After HPHT Processing
GE POL Diamonds: Before and After

This article explores and identifies the changes that type IIa GE POL diamonds experience before and after HPHT annealing.

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Four types of heated Baltic amber
Experimental Studies on the Heat Treatment of Baltic Amber

Amber samples were heat-treated, using various procedures and parameters, in an effort to reproduce materials found in the jewelry market.

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Prasiolite with Brazil-law twinning in optic-axis direction
Prasiolite with Inclusion Influenced by Brazil-Law Twinning

A prasiolite specimen displaying Brazil-law twinning, usually seen in the amethyst variety of quartz, is examined.

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