A rectangle picture stone boulder opal with electric green-blues running down one side. A definite favourite of ours. 12.25 carats. 23.8 x 10.7 mm / 0.93" x 0.42". 4.3 mm...
A small rectangle picture stone boulder opal with a strong green-blues. 6.48 carats. 17.8 x 9 mm / 0.70" x 0.35". 3.6 mm / 0.14" thick. Natural solid boulder opal....
A small rectangle boulder opal with lovely greens and blues. 5.89 carats. 17.8 x 8.8 mm / 0.70" x 0.34". 4 mm / 0.15" thick. Natural solid boulder opal. Mined...
A green rectangle boulder opal with an interesting pattern. 9.11 carats. 17 x 13.3 mm / 0.66" x 0.52". 3.5 mm / 0.13" thick. Natural solid boulder opal. Mined by...
A small rectangle boulder opal with a colourful stripe. 4.17 carats. 15.2 x 8.1 mm / 0.59" x 0.31". 3.1 mm / 0.12" thick. Natural solid boulder opal. Mined by...
A small free-from boulder opal with a colourful stripe. 2.59 carats. 15.4 x 10 mm / 0.60" x 0.39". 2.9 mm / 0.11" thick. Natural solid boulder opal. Mined by...
A matrix rectangle boulder opal with a greens, blues and purples. 8.78 carats. 25 x 8.2 mm / 0.98" x 0.32". 4 mm / 0.15" thick. Natural solid boulder opal....
A matrix rectangle boulder opal with greens, blues and purples. 5.77 carats. 12.9 x 11.5 mm / 0.50" x 0.45". 4 mm / 0.15" thick. Natural solid boulder opal. Mined...
