The overall format of previous editions has been maintained and new information has been incorporated in a similar style. This edition has two new chapters, on the manufacture and enhancement of gemstones and the old chapter on the detection of synthetic, imitation and composite stones has been rearranged. In the past decade the development of new synthetics has proceeded apace. Nowadays clean rubies and emeralds need very careful investigation since they could be natural or synthetic. However careful use of the microscope can still elucidate many problems and new instruments are shown in the text.

Gem testing

Anderson, B. W

Butterworths

<p>Gem Testing has been regarded as the standard work on gem identification since it was first published in 1942. It is a practical manual designed primarily with the needs of the jeweller in mind, but it also serves as an excellent textbook for gemmology students and is widely consulted by professional and laboratory gemmologists.</p>

Gem Testing

Arts & Photography

Reference

Consumer Guides

Until 1933, the refractometer and the microscope were the two principal tools in gem testing. Then, B.W. Anderson introduced the hand spectroscope which quickly became the third vital instrument for the UK gemmologist. The publication of Anderson's papers in the mid 1950s alerted gem laboratories worldwide to the importance of this instrument. Today, its use is universal. Anderson and his lifelong colleague, Payne, both of the world's first full-time gemmological laboratory, were the pioneers in recognizing the vast potential of the spectroscope, and "The Spectroscope and Gemmology" is the extensively edited, updated and enlarged version of Anderson's original papers. The distinguished gemmologist R. Keith Mitchell undertook the editing and added chapters on the Pye spectrophotometer and on lasers. He also reproduced new line drawings of spectra in three aspects to accommodate the prism instrument in both the British version and in that favoured by American gemmologists, and in another version as seen through the diffraction grating instrument. Written for gemmologists everywhere, this book is a must for all those involved in the identification of gemstones.

The Spectroscope and Gemology

Crafts, Hobbies & Home

Payne, James

Antiques & Collectibles

Robert Hale, Ltd.

Science & Math

Chemistry

Emerson Books, Inc.

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