91 - Very Fine 18 Karat Yellow Gold Black Australian Opal and Diamond Ring Set with 18 Carat Black Australian Opal Surrounded by 4,55 Carats Round Brilliant Cut Diamonds. Signed 750. Accompanied by 1996 Altmann and Cherry PTY, LTD. Melbourne Australia Receipt Showing Original Purchase Price of $9,523.00 Australian Dollars ($9378.300 USD). Very Good Condition. Weighs 5.0 Pennyweights or 7.7 Grams. Shipping $30.00 (estimate $1,500-$2,000)