Winton Boulder Opal
Winton boulder opal comes from the opal fields of central Queensland. These opals are natural solid opal fused to Queensland ironstone, cut and sourced direct from the fields. All material is untreated.
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Green Oval Boulder Opal 32.8 ct
AU$1,700
29.45ct Natural Boulder Opal Large
AU$1,579
54.2ct Natural Boulder Opal Large
AU$1,360
The Winton opal fields
Winton is located in central Queensland. The mining efforts in this region have been producing boulder opal for over a century. The material forms in ironstone, and cutters follow the natural color bar when shaping each stone which is why Winton boulder opal comes in organic, freeform shapes.
What makes Winton material distinctive
Winton boulder opal is known for vivid, rolling color patterns including greens, blues, golds and reds that shift as the viewing angle changes. Some Winton material is transparent enough through the color bar to show depth and movement within the stone. The trade calls this pipe crystal boulder opal. It is rarer than standard boulder material. Crystal Boulder Opal has its own category within our website.
Also browse Koroit boulder opal for distinctive ironstone matrix patterning, or return to the full boulder opal collection.
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Winton Boulder Opal FAQs
What is Winton boulder opal?
Winton boulder opal is natural Australian opal sourced from the opal fields around Winton in central Queensland. It formed inside ancient ironstone and is found nowhere else on Earth. Each stone is a natural solid gemstone opal fused to its ironstone host rock.
What does Winton boulder opal look like?
Winton material typically shows vivid rolling color patterns sweeping greens, blues, golds and reds that shift as the stone moves. Some Winton stones are transparent enough to show depth through the color bar, a quality called crystal boulder opal.
What is crystal boulder opal?
Crystal boulder opal is material where the opal layer is transparent or semi transparent, allowing light to pass through the color bar and show depth and movement inside the stone. It is rarer than standard boulder material. The host rock is sandstone apposed to ironstone.
How is Winton boulder opal different from Koroit?
Winton boulder opal typically has broader, sweeping color patterns across the stone surface. Koroit boulder opal is known for its distinctive ironstone matrix, where color fills intricate channels and veins and pockets in the host rock.