 Olympic Australis is 280 mm long, 120 mm thick, and 115 mm wide (11 in long, 4.75 in thick, and 4.5 in wide).It weighs 17,000 carats (3450 g/121.7 oz/7.6 lbs)., the opal is kept in Sydney, at the offices of Altmann & Cherny Ltd.


Other notable individual opals