Boulder opal is found in select areas of inland Queensland. The term boulder comes from the ironstone on which the layer of opal is formed, often giving the opal an uneven surface to further enhance the array of colours.

Opal is formed in narrow cavities of the ironstone, when split they often form what are called 'boulder pairs'.This opal is mostly found in fields in far south western Queensland. The opal, over time has filled in the minute cavities and voids within the host rock (usually iron stone). Unlike regular Boulder Opal the host rock is part of the visual attraction of the stone, the blend of the opal and rock creates unique patterning, colour, and texture. The fields, from which Boulder Matrix Opal is sourced, have distinct differences in the appearance of the opal they produce.

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