These pieces come from the petrified forests of Banten, Indonesia, in some rare cases, the opal which is born as liquid silica, infiltrates inside and outside the branches, so after millions of years an opalized fossil is born, a rarity , a true jewel of nature These pieces are found, cleaned of impurities and then a light resin is applied to preserve the piece, because it is of volcanic origin. Natural Black Opal Indonesian, Banten Wood Fossil volcanic origin Miocene, Aquitanian ( 22 million years ago ) Multicolor, Flash fire 293 cts - 58.6 grams 56 x 46 x 21 mm the piece for sale is what you see in photos! please be careful with the description and measures Shipping via express courier