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...
A small boulder opal specimen. 65 carats / 13 grams 43.2 x 16.1 mm / 1.70" x 0.63". 14.5 mm / 0.57" thick. Natural solid boulder opal specimen. Mined by...
A small purple boulder opal specimen. 105 carats / 21 grams 31.2 x 30.3 mm / 1.22" x 1.19". 20.7 mm / 0.81" thick. Natural solid boulder opal specimen. Mined...
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 long and narrow boulder opal specimen. 105 carats / 21 grams 63 x 18 mm / 2.48" x 0.70". 11.1 mm / 0.43" thick. Natural solid boulder opal specimen....
A small boulder opal specimen. 190 carats / 38 grams 24.7 x 37.2 mm / 0.97" x 1.46". 22.9 mm / 0.90" thick. Natural solid boulder opal specimen. Mined by...
