Natural opal rough Ethiopian Welo Untreated! Multicolor flash fire 10 pieces from 15 to 25 mm about 18.2 grams - 91 cts The properties of Opal bring joy and a sense of happiness, increase the joy of living, stimulate artistic creativity and imagination. Lamp light condition! beautiful colors also sunlight! Standard shipping ( 2-7 days for Italy ) ( 10-20 days for Europe ) ( 15-45 days for rest of the world )