Alrosa unearths 78.02-carat diamond from its Mir mine

[caption id="attachment_825302" align="aligncenter" width="600"] The impressive pit at Mir diamond mine, now an underground operation.[/caption] Russia-owned diamond miner Alrosa has unveiled a 78.02 ct. diamond from its Mir underground mine, estimated to be worth more than $600,000 if put on auction....