Over time, liquid silica seeped into the wood, and over time, the wood fossilized, and the silica solidified. This process, lasting millions of years, gave rise to this natural wonder, an extremely rare Indonesian opalized fossil wood. Featuring a dark volcanic matrix and a multicolored opal, this is a beautiful piece for true collectors! It's extraordinary to see a fossil and a gem combined in a single specimen. Natural Black Opal Indonesian, Banten Wood Fossil volcanic origin Miocene, Aquitanian ( 22 million years ago ) Oiled Multicolor, Flash fire 4.9 cts - 0.98 grams 1 Piece 12 x 9 x 6 mm about the piece for sale is what you see in photos! 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 )