Today I offer you, directly from my personal collection, a real museum piece. There are only 8/10 specimens in the world. Usually the average weight of these opals varies from 5 to 70 ct, this piece weighs 330 ct, therefore 660 grams, over half a kg of Indonesian black opal, a true monster. This should be the biggest piece of all A great peculiarity is its beautiful branch. Don't miss your chance to own a one-of-a-kind piece. The value of these opals is usually calculated per carat, small pieces are worth from 1 euro to 5 euros per carat. Today on offer with reserve price at a special price. 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. It is recommended to clean with a cloth with a little oil once a year Museum Piece Top Quality Beautiful color Natural Black Opal Indonesian, Banten Wood Fossil volcanic origin Miocene, Aquitanian ( 22 million years ago ) Multicolor, Flash fire 3300 cts - 660 grams 233 x 130 x 43 mm the piece for sale is what you see in photos! please be careful with the description and measures Shipping via express courier