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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 ...

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The Spectroscope and Gemmology 2006, Gemstone Press, Vermont

ISBN-13: 9780943763521

2nd edition

Trade paperback

The Spectroscope and Gemmology 2006, Gemstone Press

ISBN-13: 9781683364399

2nd edition

Hardcover

The Spectroscope and Gemmology 1998, Gemstone Press

ISBN-13: 9780943763187

2nd edition

Hardcover

Spectroscope and Gemmology 1997, Robert Hale & Company, London

ISBN-13: 9780719802614

Hardcover