Blue koopa shell ring from mario kart. This was a beast. Barely hollowed out at all, it's a heavy piece.
Sterling silver, one of a kind. I made some modifications to the bottom of the shell to make it more wearable obviously. I carved the shell as one piece, added the spikes with my wax pen then carved them back down.
Cast in 3 pieces then put together.
See the work in progress stages here: