Boulder opals are easily distinguished by their layer of solid brown ironstone left on the back of the stone. Boulder opals, as the name suggests, are mined from large ironstone boulders under the ground. Thin veins of colourful opal forms in cracks and fissures in these boulders.
Boulder opals vary greatly in quality, the less desirable ones are more matte and less iridescent. This stone has 'opalescent' qualities i.e. will shimmer in sunlight.
The stone weighs 9.88 grams and measures 38mm long x 30mm wide.
Please see chain options. Please note if you choose a boxlink chain I can make the chain any length under 80cm if you email me.