In this category you will find unique Australian Boulder Opals in their natural rough extracted state, unshaped to any specific form. Some are pieces, sometimes splits, of the original host boulder, or in case of Yowah nuts, they are can be the entire boulder found. Use these stones as they are or perform your own cut and polish.
We created a region filter to select areas like Yowah, other smaller opal fields may be mentioned in the stone detailed description along with patterns and colours.
Boulder Opals, characterised by solid brown ironstone matrix or layers, and found ONLY in Australia are the second most valuable opals in the world after Black Opals.