Onyx

Onyx is a powerful warrior stone and helps push out the negative thought patterns that come from fear. 
 

It is a gemstone of inner strength and protection.
 

Black onyx can enhance your endurance and persistence, helping you to power through even the most dreary and unpleasant tasks. 
 

It's also an excellent stone for people that are quickly distracted or influenced. 
 

Onyx is a slow-working stone which takes some time before you see or feel results.