A large free-form boulder opal with strong green, blue and purple colours. 28.27 carats. 47.6 x 13.3 mm / 1.87" x 0.52". 4.8 mm / 0.18" thick. Natural solid boulder...
A lovely square boulder opal with pink and green stripes. 51.34 carats. 24.4 x 24.3mm / 0.96" x 0.95". 7.5 mm / 0.29" thick. Natural solid boulder opal. Mined by...
A fantastic geometric large pair of matrix boulder opals with rainbow colours. 45.40 carats (total). 4.39 (L) and 4.64 grams (R). ~ 27.6 x 14.3 mm / 1.08" x 0.56"....
A large caramel, blue and ironstone boulder opal. 30.98 carats. 43.5 x 14.9 mm / 1.71" x 0.58". 5.2 mm / 0.20" thick. Natural solid boulder opal. Mined by Sue...
A free-form caramel boulder opal with a rainbow stripe. 8.82 carats. 24.2 x 11.9 mm / 0.95" x 0.46". 4.3 mm / 0.17" thick. Natural solid boulder opal. Mined by...
An extra large caramel, green and matrix boulder opal. 49.55 carats. 52.2 x 24.7 mm / 2.05" x 0.97". 7.5 mm / 0.29" thick. Natural solid boulder opal. Mined by...
A beautiful small teardrop matrix boulder opal with flashes of green, blue and red. 5.70 carats. 17.8 x 12.7 mm / 0.70 x 0.50". 3.3 mm / 0.13" thick. Natural...
