Opal is born as a liquid silica that solidifies over millions of years, in some rare cases, this gel incorporates fossil remains of millions of years, Wello in ancient times was a marine area, this justifies the presence of small fossil plant remains in the inside the opal, nature has created a unique and rare piece. Silver 925 - Ring Natural Crystal Opal Rough (Very rare with root fossil inclusion) 3,40 grams (total silver and stones) Untreated opal, Ethiopia, Welo Size: 7.5 USA Opal: 10 x 8 mm about Lamp light condition! Standard shipping ( 2-7 days for Italy ) ( 10-20 days for Europe ) ( 15-40 days for rest of the world )