Rare Fossilised Dinosaur Bone Ring - Natural Designer GemstoneThis gorgeous stone is a fossilised agatised Dinosaur Bone. This type of fossil is a rare form of fossilized dinosaur bone where the original bone has been naturally replaced with silica based compounds, such as agate, jasper, chalcedony, or opal. It can be traced back to dinosaurs that roamed the earth during the late Jurassic Age around 150 million years ago. The highly agatised, uniquely patterned dinosaur bone used in our rings is found in the