A beautiful free-form boulder opal with brilliant colours on a dark background / body tone. 14.50 carats. 25 x 14 mm / 0.98" x 0.55". 5 mm / 0.19" thick....
A large free-form boulder opal with brilliant rainbow colours. 20.15 carats. 28 x 14 mm / 1.10 x 0.55". 3 mm / 0.11" thick. Natural solid boulder opal. Mined by...
A large oval boulder opal with brilliant rainbow colours. 23.91 carats. 31.7 x 15.1 mm / 1.24 x 0.59". 5.1 mm / 0.20" thick. Natural solid boulder opal. Mined by...
A beautiful large diamond boulder opal with brilliant colours on a dark background / body tone. 6.86 carats. 24.3 x 14.3 mm / 0.95" x 0.56". 2.8 mm / 0.11"...
A large boulder opal with strong rainbow stripes on a lighter background / body tone. 22.13 carats. 28 x 14.4 mm / 1.10 x 0.56". 6.6 mm / 0.25" thick....
A large geometric boulder opal with greens and blues and a black background / body tone. 16.71 carats. 32.3 x 10.5 mm / 1.26 x 0.41". 5.2 mm / 0.20"...
A narrow, free-form boulder opal with a fantastic strong colours, including hot pink! 9.85 carats. 34.2 x 8.2 mm / 1.34 x 0.32". 3.6 mm / 0.14" thick. Natural solid...
