A long slender free-form boulder opal with some lovely rainbow colours. 3.05 carats. 22.3 x 4.7 mm / 0.87" x 0.18". 2.9 mm / 0.11" thick. Natural solid boulder opal....
A long slender rectangle boulder opal with some lovely rainbow colours. 4.15 carats. 26.9 x 1.8 mm / 1.05" x 0.31". 3 mm / 0.11" thick. Natural solid boulder opal....
A large geometric boulder opal with green-blues and a wonderful purple stripe that runs down the middle. 49.73 carats. 57.9 x 16.2 mm / 2.27 x 0.63". 6.2 mm /...
A beautiful marquise-shaped boulder opal with green-blue stripes on a dark body tone / background. 25.43 carats. 48.7 x 12 mm / 1.91" x 0.47". 4.7 mm / 0.18" thick....
A large, free-form boulder opal with green-blues on a lighter body tone / background. 49.27 carats. 42 x 17 mm / 1.65" x 0.66". 7 mm / 0.27" thick. Natural...
A lovely large free-form boulder opal with ocean green-blues. 68.52 carats. 33.5 x 28.3 mm / 1.31" x 1.11". 10 mm / 0.39" thick. Natural solid boulder opal. Mined by...
A lovely free-form purple boulder opal. 28.17 carats. 38.2 x 13.1 mm / 1.50" x 0.51". 6.5 mm / 0.25" thick. Natural solid boulder opal. Mined by Sue at...
