This drilled Australian boulder opal is about 3.5cm tall and weighs 19g; diameter hole about 3mm.
The brown matrix with thin, colored (mostly blue) opal veins is characteristic for the Australian boulder opals.
In gemmology, boulder opals are used when humor and joie de vivre are to be strengthened. The colorful opal supports to infect his fellow men with his own (life) joy and not to lose courage and confidence despite sometimes difficult circumstances.
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