Boulder Opals Adelaide

Boulder opal forms in the cracks and cavities of ironstone in outback Queensland, and the natural brown host rock is left on the back of the stone — giving boulder opal its strength and its unmistakable, one-of-a-kind patterns. Prized as the second most valuable opal after black, its colours can be every bit as vivid. We choose each boulder opal by hand for character and brilliance. Explore rings, pendants, earrings and loose stones, or commission a bespoke piece.
Boulder Opal Pendant with colours of brown, red and blue

Boulder Opal Jewellery

The Australian Opal and Diamond Collection offer a stunning range of Boulder Opal rings, pendants and earrings. We also offer loose Boulder Opal gemstones. If you have a particular design in mind, our experienced jewellers can bring your ideas to life in a stunning one-of-a-kind design. Contact us today to find out more.


What is a Boulder Opal?

A Boulder Opal is a type of precious opal that forms within ironstone or sandstone boulders. It is renowned for its vibrant play-of-colour and unique patterns.

Where are Boulder Opals found in Australia?

Boulder Opals are primarily found in Queensland, Australia, with major mining areas located in places like Quilpie, Winton, and Opalton.

What makes Australian Boulder Opals unique?

Australian Boulder Opals typically form on a foundation of iron stone. Boulder Opals are characterised by their unique flowing patterns and colours, undulating surfaces and large unique shapes. All of AODC's Boulder Opals are natural and never colour treated.

Are Boulder Opals more durable than other opals?

Yes, Boulder Opals are generally considered more durable than other opals due to their natural ironstone or sandstone backing, providing added strength and stability.

Do you offer custom Boulder Opal jewellery?

Yes, we offer the option to create custom Boulder Opal jewellery, including rings, pendants, earrings, and more. Our skilled artisans can work with you to bring your unique design ideas to life using exquisite Australian Boulder Opals.

How do you care for Boulder Opal jewellery?

To maintain the beauty of your Boulder Opal jewellery, avoid exposing it to extreme temperature changes, chemicals, and prolonged sunlight. Clean with a soft, damp cloth and store it separately to prevent scratches.