Carnelian

Carnelian is a reddish variety of quartz, translucent to opaque. It comes from the early Egyptians.

The wearing of carnelian is recommended to those who have a weak voice or are timid in speech, for the warm-colored stone will give them the courage they lack, so that they will speak both boldly and well," reports G. E Kunz, well known gemologist and historian.

It is recommended for those lacking physical energy as well.

People who are architects, construction workers, government workers, journalists, military personnel and salespeople would definitely benefit from wearing Carnelian.

Muhammad himself wore a silver ring/seal set with an engraved carnelian.