Carnelian

Carnelian, also known as sard, was a clear, reddish, or red-brown chalcedony.

Description
This semi-precious stone was tumbled smooth and cut cabochon, and used as decoration on devices that offered protection from evil or from bodily harm. A typical stone had a base value of 50 gp.

Notable Specimens
The Heart of the Lion was a huge specimen and a holy relic of Hajama in the land of Zakhara.