Gems & Gemology in Review: Treated Diamonds

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9780873110549: Gems & Gemology in Review: Treated Diamonds
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Once limited to easily detected dyes and coatings, diamond treatments pose formidable challenges for today s jewelers and gemologists. Gems & Gemology, GIA s award-winning quarterly journal, has combined 70 years of its coverage in a new volume titled Gems & Gemology in Review: Treated Diamonds. This book marks the third installment in G&G s review series, following Synthetic Diamonds (2005) and Colored Diamonds (2006).

Edited by GIA distinguished research fellow Dr. James E. Shigley, Treated Diamonds covers the range of enhancement techniques that have been performed to improve color (coating, irradiation, and high-pressure/high-temperature annealing) and clarity (laser drilling and fracture filling).

Each of these sections is preceded by an informative overview of the treatment process. The book features more than 300 richly illustrated pages and includes a chart on identifying fracture-filled diamond.

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About the Author:

Dr. James E. Shigley is distinguished research fellow at the GIA Laboratory in Carlsbad, Calif. He has written several groundbreaking articles on synthetic diamond identification for Gems & Gemology and other journals. Dr. Shigley received a bachelor's degree in geology from the University of California, and a doctorate in geology from Stanford University.

Review:

Appropriately, this 308-page volume follows its parent Gems & Gemology in size, format and superb presentation. Selected G&G papers from 1938 to 2007 provide a history of the modern technical developments of diamond treatments. The book is divided into two main sections arranged chronologically: treatments to improve color and those to improve clarity.

Color is improved by coating (11 entries), irradiation (25) and annealing (26). Clarity treatments include laser drilling (7) and glass filling (8). The references from the individual papers have been consolidated into a single list to improve consistency and reduce repetition. There is a very useful index.

In the epilogue, it is suggested that future treatments could include:
1. Implantation of foreign atoms into the surface layer of a polished diamond to produce a thin layer of color.
2. Nuclear transformation of nitrogen or boron atoms in a rough or polished diamond to carbon, thereby removing any yellow or blue coloration caused by those elements.
3. Coating with a thin layer of colored synthetic diamond, either to create a fancy color or to reduce the yellowish appearance of a D-to-Z diamond.

Gemologists, mineralogists, physicists, dealers, collectors, jewelers and those curious about diamonds should all inspect this beautifully produced volume. It includes numerous superb photomicrographs of treated diamonds by renowned researchers and expert photographers, and a wealth of easily accessed information. Treated Diamonds could grace a coffee table or a research library and is a very good value. --Alan Jobbins

President, Gemmological Association and Gem Testing Laboratory of Great Britain (Gem-A)

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