This is a Natural Matrix Boulder Opal from the Winton Opal fields in Queensland in Australia. It has been drilled and fitted with a Sterling Silver bail so it is ready to be used as a pendant The precious Opal shows a pinpricks of fiery colours, which can be seen set in brown stone which is typical of those from the Winton fields.
If you see an opal on this website that you might like to have as a pendant, please contact Peter to discuss if it is possible with that particular stone.
You also need to state if you wish to have a bail fitted or not. If you do, then you would need to be charged for the cost of metal, silver or gold.