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Diamonds

A selection of diamonds.

Main article: Diamond

Diamonds, long considered the most prized of gemstones, were first mined in India.^{[citation needed]} Pliny may have mentioned them, although there is some debate as to the exact nature of the stone he referred to as Adamas;^[5] Currently, Africa, Australia, and Canada rank among the primary sources.^{[verification needed]}

The British crown jewels contain the Cullinan Diamond, part of the largest gem-quality rough diamond ever found (1905), at 3,106.75 carats. Now popular in engagement rings, this usage dates back to the marriage of Maximilian I to Mary of Burgundy in 1477.

Source from : http://en.wikipedia.org/wiki