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Once a stone is cut, polished and graded, it can be identified by its cut, colour, carat weight and its clarity in combination.

A certified gemologist who provides a certificate for a stone can generally document any stone's unique characteristics, so that it can be identified given this combination of variables.

As well, some stones are identified with lasered identification symbols and numbers on the girdle -- invisible to the naked eye, but easy to see with a jeweler's 10x loop.

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