Queensland Boulder Opal, Koroit Opal and Yowah Nuts

Explore wild and naturally patterned solid boulder opals from Queensland. This collection includes ironstone boulder opals, intricate Koroit matrix stones, and rare Yowah Nuts—each hand-cut and one-of-a-kind.

What are boulder opals?
Boulder opals are solid opals naturally attached to ironstone backing. They’re mined in Queensland and are known for their vibrant veins and earthy tones.

What makes Koroit and Yowah Nuts unique?
Koroit opals feature intricate natural matrix patterns, while Yowah Nuts are small ironstone nodules often filled with opal. Each one is completely unique.

Are these suitable for jewellery?
Yes. These stones are often used in statement rings, pendants and one-of-a-kind jewellery designs.

Are these opals treated or natural?
All our boulder, Koroit and Yowah opals are 100% solid and natural—never treated or enhanced.

Looking for a particular design?
Iona can create a personalised piece just for you! Simply choose an opal you love and reach out for an obligation-free quote.