Boulder Opal

Boulder Opal is opal which forms in cavities of ironstone, and is found in Queensland, Australia. The opal forms within cracks both horizontally and vertically in boulders. When cut, the ironstone is usually left on the back, which gives the cut gem a natural dark aspect. Because of the dark backing, the boulder opal absorbs more light than white and crystal varieties, and this means contrasting colours are more rich and vibrant.

Free ring measure

Not sure what to get? Let us help

Enter your details below and one of our friendly staff will call you to help you decide what’s best for your situation

Our Stories

Check out our amazing team