Three natural Australian crystal rough cuts already showing some nice opal colour. The second photo shows the reverse side of the stones. They are 11, 13, and 20mm in length. Add them to your collection or cut and polish them as you please. From a Jeweller's estate, who sourced all his opals direct from the opal fields in the 1970s-1980s, and supplied in-trade customers around New Zealand. See my other listings for more delightful opals.