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

Contents include the history and development of spectroscopy; a discussion of the nature of absorption spectra and the absorption spectra of solids and gem mine

This edition has been completely revised to cover the latest methods of gem enhancement and identification, as well as the most up-to-date test instruments and

Gemmology is a text for students preparing for the Gemmological Association's Preliminary and Diploma examinations. The book is more expansive and up-to-date th

Gemmological Instruments deals with the developments in diamond grading equipment and gem testing instruments since the publication of the first edition in 1978