Right now, in a vault controlled by the Los Angeles County Sheriff’s Department, there sits a 752-pound emerald with no rightful owner. This gem is the size of a mini­fridge. It weighs as much as two sumo wrestlers. Estimates of its worth range from a hundred bucks to $925 million. Eight years ago the emerald was logged into evidence by detectives Scott Miller and Mark Gayman of the Sheriff’s Major Crimes Bureau. The two men are longtime veterans: 30 years for Miller, 28 for Gayman.

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