In this category you will find unique Australian Koroit Boulder Opals or Yowah Nuts 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 nuts, they are can be the entire boulder found. Use these stones as they are or perform your own cut and polish.
Koroit Opals, are part of the Boulder Opal family which are characterised by solid brown ironstone matrix or layers interlaced with the opal and are the second most valuable opals in the world after Black Opals. Koroit Opals take their name from the Koroit mining area near Yowah in South West Queensland and are very thought after due to their unique pattern.
Yowah nuts are mini boulders of 5mm to 20cm which host an opal, also specific to the Yowah region.