A stunning free-form boulder opal with strong, bright colours. 8.32 carats. 18.3 x 11.5 mm / 0.72" x 0.45". 4.8 mm / 0.18" thick. Natural solid boulder opal. Mined by...
An extra large geometric boulder opal with bright rainbow colours. 31.32 carats. 54.6 x 14 mm / 2.14 x 0.55". 5.7 mm / 0.22" thick. Natural solid boulder opal. Mined...
A one-of-a-kind large rectangle boulder opal with colourful patterning on a black body tone (background). Definitely an artwork by mother nature herself. 34.71 carats. 35.4 x 18.5 mm /...
A wonderful rectangle boulder opal with a colourful rainbow stripes. 7.91 carats. 13 x 12.7 mm / 0.51" x 0.50". 4.1 mm / 0.16" thick. Natural solid boulder opal. Mined...
A fantastic triangle boulder opal with a colourful band running through its center. 5.13 carats. 14.2 x 12.4 mm / 0.56" x 0.48". 3.8 mm / 0.14" thick. Natural solid...
A lovely oval boulder opal with multiple colours, caramel stripes, and a lighter background / body tone. 7.28 carats. 18.4 x 10.1 mm / 0.72" x 0.39". 4.9 mm /...
A small and colourful pair of rectangle boulder opals with green-blues and caramel stripes. 5.51 carats (total). ~ 14.1 x 6.4 mm / 0.55" x 0.25". ~ 3 mm /...
An extra large boulder opal with some great sea green colours. 85.39 carats. 44.2 x 40.1 mm / 1.74" x 1.57". 8 mm / 0.31" thick. Natural solid boulder opal....
