This stone comes from the Koroit opal fields of Queensland, Australia. It shows Red, Orange and Green opal embedded in brown ironstone. It would be a very nice pendant and could be drilled and fitted with a bail at a small extra cost.
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.