This is for a Parcel of Natural ETHIOPIAN BLACK CRYSTAL WELO OPAL. Crystal Black Opal is considered to be Rare. Only other Opal more Rarer is True Black Opal (which are sometimes sold as remarked). These Opals are nice. All of them have nice Fire, and Multi-Color. Some could be potentially cut, and polished into a nice gemstone, with a good cutter. These stones would be nice in any collection. These stone are good for Collecting, Gifts for that Special Someone and Special Occasions.