Polished Australian Boulder Opal Trace. Looks like a painting when in hand. This we purchased along with a small parcel direct from the opal fields. It has been mounted in 925 solid silver mount. As the light hits it you get flashes of Blue Opal it is 40mm x 22mm. Chain is available please ask for price. One of over 20 Silver mounted pieces we have as a trade parcel or sell individually. Contact me for more info. Why not visit to choose your own trade selection.