Diamonds may be a girl's best friend, but for the police they are a major nuisance. Once they are stolen, they are among the easiest of valuables to sell. Even if they are recovered, the four Cs of the diamond business—cut, clarity, carat and color—provide only the roughest means of identification. In fact, identification is sometimes so difficult that police have occasionally been forced to return diamonds to a known thief because there was no proof that they were stolen goods. Now, Israeli scientists think they have solved the gem identity crisis with a system that they claim is as infallible...
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