This is the standard reference for over twenty years now completely revised & updated with many new illustrations. Gemstones of the World" is the most comprehensive & informative colour manual of the worlds gemstones &
Includes:: more than 1 400 examples. Opposite each illustration the text provides an exact description of the particular stone including details of the properties & chemical composition which makes the stone unique. Information on location of major deposits alternative names stones most easily identified incorrectly & diagrams of their crystal habits are also given. The tables on gemstones properties & constants provide a basic system of elimination for all unidentified stones. There are also eleven tables listing commercial & mineral names refractive indices dispersion pleochroism fluorescence absorption spectra & specific gravities of gems. From the historical to the scientific this extraordinary reference source is filled with fascinating facts about gemstones both precious & semi-precious. Its also a worldwide scientific survey with stunning colour photographs of each gem & its varieties."