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