Millions of years have created this beautiful gemstone, directly from the Winton mines in Australia. This stunning rough boulder opal is 100% natural and untreated. It boasts high brilliance and beautiful flashes of green and blue. Very Beautiful Opal Natural Boulder Opal Rough Australian, Winton 66 cts - 13.2 grams 1 piece - 30 x 17 x 12 mm about UNTREATED! Lamp light condition! Photo wet piece please be careful with the description and measures Standard shipping ( 2-7 days for Italy ) ( 10-20 days for Europe ) ( 15-40 days for rest of the world )