Gem deposits are rare because, in general, the conditions that promote their formation are unusual. Modern geological and analytical techniques have now been applied to gem occurrences in Canada and elsewhere throughout the world, leading to some radical changes from a geological viewpoint. This volume looks at gemstones from a geological perspective and reviews current concepts on the origin and emplacement of diamond, ruby sapphire, emeralds and other coloured gems.

It is appropriate that the book opens with a chapter on diamond, not only because of its importance as a gemstone but also because in recent years Canada has developed...

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