The largest black opal weighs 11,340.95 carats (2,268.19 grams; 80 oz) and measures 2,450 x 1,460 x 527 mm (96.45 x 57.48 x 20.74 in). It is owned by Dallas, Judith, Shannon, Jeffery and Ken Westbrook (all Australia).

The black opal was found in Lightning Ridge, New South Wales, Australia.