This is Crystal Opal from Lightning Ridge, New South Wales, Australia ready to be set as a piece of jewellery and would make a very nice pendant. It shows Green and Aqublue colour in one angle and Purple in another. Body tone of 8 with a Brightness rating of 5.5.
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.