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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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Rough CLIPPIR diamonds
The Very Deep Origin of the World’s Biggest Diamonds

Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular and Resorbed), that formed in a super-deep environment.

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GemCad View of the French Blue Enclosed Within the Tavernier Blue
A Crystallographic Analysis of the Tavernier Blue Diamond

This study uses both historical information and modern data to create a computer model of the Tavernier Blue, orienting the finished diamond within the original diamond crystal.

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The Cullinan Diamond Centennial: A History and Gemmological Analysis Of Cullinans I And II

Eight decades after the Cullinan diamond was mined, a team of gemmologists examined the two famous gems that were created from it to become part of the Crown Jewels of England.

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An Important Exhibition of Seven Rare Gem Diamonds

The stories behind seven strikingly beautiful rare natural diamonds, united in an exhibit at the Smithsonian, are told here.

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Estimating Weights of Mounted Coloured Stones

Updated formulas are presented for estimating the weights of mounted coloured gemstones.

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Modern Diamond Cutting and Polishing

Over the last 25 years, the diamond-cutting industry worldwide has been revolutionised by sophisticated instruments that provide invaluable aid in the process of creating a polished gem.

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A History of Diamond Sources in Africa: Part II

This article explores the mining developments and new diamond occurrences in Africa that led to many of the key concepts in modern geology.

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Diamonds from the Argyle Mine
An Economic Review of the Past Decade in Diamonds

The diamond industry has been buffeted by extreme price volatility during the last decade, unlike any encountered since the Great Depression of the 1930s.

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The Changma Diamond District, Mengyin, Shandong Province, China

One of China's most important discoveries to date is the Changma kimberlite district in Shandong Province.

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