With black opals, the general rule is the darker the base and the colour bar sitting on top of it, the greater its worth per carat. Red hues are also highly prized. Photo courtesy: Giulians
With black opals, the general rule is the darker the base and the colour bar sitting on top of it, the greater its worth per carat. Red hues are also highly prized. Photo courtesy: Giulians
With black opals, the general rule is the darker the base and the colour bar sitting on top of it, the greater its worth per carat. Red hues are also highly prized. Photo courtesy: Giulians
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