Gemmology, Third Edition

Since Gemmology was first published, thousands of readers have used it to gain an in-depth appreciation of the science of gemmology, its history and practice. This third edition has been revised to cover, in particular, This third edition has been revised to cover, in particular, new HPHT diamond enhancement methods and beryllium lattice diffusions techniques for corundum as well as the low pressure high temperature CVD synthesis of thick film diamond It includes details of the Gemmological Associations recently introduced Foundation course, and provides examination notes. \* Contains essential information for the Gem-A exams \* Fully updated to cover recent advances and instruments \* An invaluable resource for gemmologists worldwide Content: The geological origin, occurrence and locality of gemstones -- The chemical composition of gemstones -- Crystallography -- Cleavage, parting and fracture -- Hardness -- Specific gravity, density and relative density -- Colour, lustre and sheen -- Reflection and refraction -- Polarization and pleochroism -- Spectroscopy -- Luminescent, electrical and thermal properties of gemstones -- The hand lens, microscope and Chelsea filter -- Gemstone enhancement -- Synthetic gemstones and gemstone simulants -- Identifying inorganic gemstones and their synthetic counterparts -- Identifying inorganic gemstone simulants -- Identifying organic gem materials and their simulants -- The fashioning of gemstones -- Practical gemstone identification. "Since Gemmology was first published, readers have used it to gain an in-depth appreciation of the science of gemmology, its history and practice. This third 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 laboratory techniques. It includes details of the Gemmological Association's Foundation Course together with advice on examination techniques."--Jacket