Black Opal Site

Boulder - Opal distinguished by the presence of host brown rock, usually ironstone, on the back of the opal seam; almost exclusively from Queensland.

Boulder Doublet - Usually cut from thin Opalized shells which are artificially attached to an ironstone backing.

Broad Flash - Large areas of flash in the opal.

Black - Opal with a dark (black) body color: Rare.

Block Pattern - Pattern displaying large particles of color.

Cabochon - Refers to the dome shape of the stone.

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