Alrosa analysts at its Diamond Sorting Center estimate the auction value of the diamond at in excess of $600,000.
Russian diamond mining giant Alrosa has recovered a 78.02-carat diamond from its Mir kimberlite pipe.
The miner, which produces a quarter of global output, said in a statement tha t the diamond measures 28.5mm by 28.4mm by 24.2 mm.
The stone has some small inclusions , and is transparent with yellowish and greenish hues , the firm said .
