80.59-carat-round-brilliant-cut-star-of-viluysk-diamond Published December 31, 2016 at 795 × 654 in STAR OF VILUYSK DIAMOND CENTERPIECE OF ALROSA DIAMOND TENDER AT THE 2017 IDWI 80.59-CARAT, ROUND BRILLIANT-CUT, COLORLESS STAR OF VILUYSK DIAMOND