A mini-boulder opal specimen. 46 carats / 9.3 grams 23.3 x 17.3 mm / 0.91" x 0.68". 10.8 mm / 0.42" thick. Natural solid boulder opal specimen. Mined by Sue...
An organic blue boulder opal specimen. 110 carats / 22 grams 25.6 x 21.2 mm / 1.01" x 0.83". 20 mm / 0.78" thick. Natural solid boulder opal specimen. Mined...
A boulder opal specimen. 140 carats / 28 grams 43 x 25.1 mm / 1.69" x 0.98". 31.1 mm / 1.22" thick. Natural solid boulder opal specimen. Mined by Sue...
A small boulder opal specimen. 105 carats / 21 grams 31 x 26 mm / 1.22" x 1.02". 19.5 mm / 0.76" thick. Natural solid boulder opal specimen. Mined by...
A small boulder opal specimen. 105 carats / 21 grams 36 x 32.7 mm / 1.41" x 1.28". 18 mm / 0.70" thick. Natural solid boulder opal specimen. Mined by...
A small curvy rainbow boulder opal specimen. 120 carats / 24 grams 48 x 21.7 mm / 1.88" x 0.85". 20.6 mm / 0.81" thick. Natural solid boulder opal specimen....
A small green-blue boulder opal specimen. 95 carats / 19 grams 26.5 x 27 mm / 1.04" x 1.06". 19.6 mm / 0.77" thick. Natural solid boulder opal specimen. Mined...
A small green-blue swirl boulder opal specimen. 75 carats / 15 grams 36.9 x 16.5 mm / 1.36" x 0.62". 14.2 mm / 0.68" thick. Natural solid boulder opal specimen....
