A beautiful half-moon boulder opal with rainbow colours on a lighter body tone / background. 11.73 carats. 30.1 x 9.7 mm / 1.18" x 0.38". 4.9 mm / 0.19" thick....
A stunning pair of circle pair of matrix boulder opals with green, blues and whites. 23.80 carats (total). 2.47 (L) and 2.28 grams (R). Left ~ 20.6 x 20.6 mm...
A stunning boulder opal with brilliant rainbow colours and wonderful movement. 11.76 carats. 21.3 x 13.8 mm / 0.83 x 0.54". 4.4 mm / 0.17" thick. Natural solid boulder opal....
A very unusual hexagon matrix boulder opal. We especially love the natural white stripes. 41.21 carats. 29.2 x 27.4 mm / 1.14" x 1.07". 5.9 mm / 0.23" thick. Natural...
A free-form boulder opal with sea green-blues and a pink 'wave'. 8.49 carats. 23.5 x 10 mm / 0.92" x 0.39". 4.3 mm / 0.16" thick. Natural solid boulder opal....
A beautiful free-form boulder opal with pastel swirls and stripes. 26.38 carats. 22.7 x 19.6 mm / 0.89 x 0.77". 6.7 mm / 0.26" thick. Natural solid boulder opal. Mined...
A lovely boulder opal with pastel stripes. 19.44 carats. 25.3 x 13.9 mm / 0.99 x 0.54". 6.4 mm / 0.25" thick. Natural solid boulder opal. Mined by Sue at...
A beautiful free-form boulder opal with some pastel pin fire colours. 13.55 carats. 20.2 x 15.4 mm / 0.79 x 0.60". 4.9 mm / 0.19" thick. Natural solid boulder opal....
