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....
An extra small free-form boulder opal with strong green-blues and a black background / body tone. 1.70 carats. 10 x 6 mm / 0.39" x 0.23". 2.7 mm / 0.10"...
A small triangle boulder opal with broad rolling flashes of colour on a semi-dark background / body tone. 4.16 carats. 17.6 x 7.4 mm / 0.69" x 0.29". 3.7 mm...
A round boulder opal with strong green-blue and caramel stripes. 10.76 carats. ~ 16.2 x 15.8 mm / 0.63 x 0.62". 4.3 mm / 0.16" thick. Natural solid boulder opal....
A small, free-form boulder opal with strong rainbow colours. 6.80 carats. 21.1 x 8.5 mm / 0.83 x 0.33". 4.3 mm / 0.16" thick. Natural solid boulder opal. Mined by...
A free-form boulder opal with broad flashes of rainbow colours with a dark background / body tone. 18.33 carats. 25.2 x 14.7 mm / 0.99 x 0.57". 5.6 mm /...
An extra small boulder opal with rainbow colours. 2.14 carats. 10.1 x 8.3 mm / 0.39 x 0.32". 3 mm / 0.11" thick. Natural solid boulder opal. Mined by Sue...
