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“Eliminate all other factors and the one which remains must be the truth” Sherlock Holmes

Gemmology is the science of identifying and evaluating gemstones. Short of destructive testing, which would be pointless to say the least, it is not possible to positively identify a gemstone using a single test. The process is one of elimination and even when a particular stone is identified, its origin and the possibility that it could be a man made crystal have to be considered.