You're going to love the rustic versatility of these Boulder Opal Beads. These are grade A line of round Australian boulder opals (approx. 8mm). Boulder Opal Bead 10K Necklace Features: Australia produces around 97% of the world’s opal. Boulder opal consists of concretions and fracture fillings in a dark siliceous ironstone matrix. It is found sporadically in western Queensland. These Boulder beads are rare and ad beautiful as beads get.

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