Here's a recent ring commission for you, a fossilized piece of a T-Rex skull inlaid into Ancient Kauri wood. The wood is from a pre-historic Kauri forest that grew 50,000 years ago and was preserved in the last Ice Age under the surface of the North Island of New Zealand. The T-rex had a massive skull that was balanced by it's large tail.
Rex translates in latin to King, making this a ring for a king.