Sardonyx

Sardonyx 
A stone of strength and protection
A grounding stone
Provides stabilization, strength, endurance and fortitude to create good fortune based on good moral ethics
Improves perception
Can bring lasting happiness and stability to a marriage or partnership
Alleviates depression
A good stone for builders, athletes, physical therapists, chiropractors and massage therapists
 
These are priced by weight and not necessarily by size.