Examines the current available means of determining the geographic origin of gem-quality diamond, which are based largely on trace element and isotopic characteristics. For now, no method exists for determining the provenance of a random individual diamond.

Examines the variety of fluid inclusions contained within diamond, which reflect the natural processes that created and modified these gems deep within the earth’s mantle.

The Perot Museum of Nature and Science promotes public interest in mineral studies with The Year of Mineralogy exhibit.

An examination of a beaded bracelet reveals calcite powder to enhance the imitation of natural root amber.

Rubies from Mozambique, which were examined at the Lotus Gemology lab in Bangkok, proved to be infilled with böhmite, a secondary mineral in corundum.

This installment of “Colored Stones Unearthed” explores inclusions in gems—how they form, how they are studied, and what they mean for gemologists and geoscientists.

Numerous etch channels are observed in a 5.19 ct type IIa natural diamond.

Reports on diamonds from Guyana’s alluvial deposits, including mining history and practices.

Offers the first detailed summary of amber from the Vietnamese island of Phu Quoc and a comparison with Baltic, Dominican, and Burmese material.

A unique jade cabochon with vivid green bodycolor and pronounced chatoyancy is examined at a lab in Shanghai.