Gemmologists' CompendiumThis is the seventh edition of a book which has been for years the 'bible' of professional and amateur gemmologists, as well as retail jewellers. Originally written by Robert Webster, an expert who dedicated most of his life to the subject and who worked in the London Gem Testing Laboratory for twenty-five years, this edition has been completely revised and updated by E. Alan Jobbins, Keeper of Minerals and Gemstones at the Geological Museum in London for thirty-five years. The first part of the book is a comprehensive glossary on all aspects of gemstones and the terms associated with them. The second part includes sections on manufactured gems, the enhancement of gem materials and on the precautions necessary for avoiding damage to gemstones and jewellery during manufacturing, repairs and cleaning. There are comprehensive sets of tables of the physical constraints needed for gem testing, of the sources of gem materials and the cuts used to demonstrate their beauty. Fifteen pages of colour photographs will assist in the identification of inclusions and there are many useful conversion tables. |
Contents
Preface to Fifth Edition | 9 |
Diamond colour grading Comparison of schemes for 225 | 45 |
Base system for price of pearls 221 | 114 |
Copyright | |
12 other sections not shown
Common terms and phrases
absorption acid Alexandrite Almandine Amber Anatase Andalusite angle Apatite Aquamarine atomic Australia Axinite bands Beryl blue Brazil brown Calcite calcium Canada carat Cassiterite Chalcedony Chrysoberyl colour colourless corundum cubic Danburite Datolite Demantoid Di-iodomethane diamond diopside doublet Enstatite Epidote Euclase facets Feldspar Fibrolite fluorescence Fluorite garnet gemstones glass green Grossular heat hematite Hessonite Idocrase imitation inclusions India Iolite jade Jadeite jewellery Kyanite lamp lapis lazuli light liquid Localities long-wave Madagascar material metal Mexico mineral misnomer Monoclinic moonstone Myanmar name applied Namibia nephrite opal opaque Optic Orthorhombic pale Peridot Phenakite pink produced Pyrope quartz rays refractive index resin Rhodonite rock crystal ruby Russia rutile sapphire Scapolite serpentine Sinhalite Smithsonite South Africa specific gravity spectrum is due Spessartine Sphene Spinel Spodumene Sri Lanka stones surface synthetic emerald Tanzania topaz tourmaline turquoise ultra-violet USA Arizona USA California usually violet yellow Zircon Zoisite