Yowah opal rough, is mainly sold as yowah nuts, they look like brown nobbies and have to be snipped to show if there is any opal colour in them. there is very little of this rough available most of the time. Source your Yowah roug opal direct from opal miners and opal wholesalers and dealers for your single rough gem opal or parcel Yowah rough opals from Yowah Australia Yowah opal fields are mostly hand worked instead of large machinery and lot of yowah nuts are found by fossicking and a few open cut mines have recently opened up large scale opal mining.the yowah Opal festival is held in mid july and also holds a jewellery competition at the same time . Yowah Nut Opal, Ironstone Matrix Opal, Opalized Wood Opal. Conglomerate opal slabs from Yowah make top displays as natural patterns and kernels look interesting.