Opal in principle is a liquid silica, which solidifies over millions of years, forming the opal, in some rare cases, some biological remains are incorporated into the silica, giving life to a masterpiece of nature. In this case, this opal has agglomerated plants/Roots (fossils). Natural Crystal opal Polished Freeform Top Colors (brightness 4.5 out of 5) Very rare with plant fossil Ethiopian Welo Untreated! Multicolors 1 piece ( 12.5 x 9 x 7 mm ) about 0.69 grams - 3.45 cts the pieces for sale is what you see in photos! Lamp light condition! beautiful colors also sunlight! please be careful with the description and measures Standard shipping ( 2-7 days for Italy ) ( 10-20 days for Europe ) ( 15-45 days for rest of the world ) if you want fast shipping, please contact me immediately after the auction win