Four beautiful Australian crystal opal rough cuts with intense opal colours. Wow! The second photo shows the reverse side of the stones. They are between 13mm and 15mm in length. They would decrease in size after being cut and shaped and polished. Lovely gems to collect, or make them the stars of your own jewellery designs. These natural, untreated opals are from a Jeweller's estate. He sourced all his opals direct from the opal fields of Australia predominantly in the 1970s-1980s, and supplied in-trade customers around New Zealand. See my other listings for more delightful opals.