Directly from the Winton mines in Australia, large lot of 10 natural, untreated Australian boulder opals. Natural Opal Rough Australian, Winton 10 Pieces - 15 to 38 mm about 38.7 grams - 193.5 cts Multicolors UNTREATED! Photo wet pieces the piece for sale is what you see in photos! Lamp light condition! The properties of Opal bring joy and a sense of happiness, increase the joy of living, stimulate artistic creatività and imagination. Its properties facilitate contacts and alliances and rebalance energy and emotion Bridge stone between heart and throat called the "Gem of God", symbolizes justice, harmony and emotional depth. It is believed that certain gemstones and minerals have beneficial health and spiritual properties. Catawiki cannot guarantee or be held liable for these suggested attributes which have no scientific evidence and cannot be considered a substitute for traditional medical treatment. Standard shipping ( 2-7 days for Italy ) ( 10-20 days for Europe ) ( 15-40 days for rest of the world )