A free-form boulder opal with blues and green swirls. 10.90 carats. 25.2 x 13.3 mm / 0.99 x 0.52". 3.8 mm / 0.14" thick. Natural solid boulder opal. Mined by...
A triangle boulder opal with blues and green swirls. 7.55 carats. 23.6 x 11.9 mm / 0.92 x 0.46". 4.2 mm / 0.16" thick. Natural solid boulder opal. Mined by...
A large rectangle boulder opal with strong blues and green swirls. 8.55 carats. 25.8 x 11.8 mm / 1.01 x 0.46". 4.1 mm / 0.16" thick. Natural solid boulder opal....
A triangle boulder opal with lovely blues and green swirls. 13.43 carats. 27 x 15.8 mm / 1.06 x 0.62". 4.3 mm / 0.16" thick. Natural solid boulder opal. Mined...
A geometric boulder opal with pink, blue and green swirls. 9.52 carats. 25.5 x 11.8 mm / 1.00 x 0.46". 4 mm / 0.15" thick. Natural solid boulder opal. Mined...
A geometric boulder opal with pink, blue and green swirls. 19.12 carats. 25.8 x 16.5 mm / 1.01 x 0.64". 5.1 mm / 0.20" thick. Natural solid boulder opal. Mined...
A triangle boulder opal with strong blues and greens. 21.35 carats. 34.7 x 18.7 mm / 1.36 x 0.73". 4.1 mm / 0.16" thick. Natural solid boulder opal. Mined by...
A large rectangle boulder opal with strong blues and green swirls. 30.37 carats. 26 x 18.2 mm / 1.02 x 0.71". 6.1 mm / 0.24" thick. Natural solid boulder opal....
