- Dallas, Judith, Shannon, Jeffery and Ken Westbrook
- 2268.19/2450/1460/527 carat(s)
- Australia (Belmont .N.S.W Australia)
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.