Millions of years have shaped this stunning gemstone, directly from the Winton mines in Australia. This stunning rough opal is 100% natural and untreated. It boasts high brilliance and beautiful flashes of red, yellow, and green (primarily red). Very Beautiful Opal Natural Boulder Opal Rough Australian, Winton 27 cts - 5.4 grams 1 piece - 25 x 19 x 10 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 )