This is approximately 20 mm bloodstone gem enclosed in a handwoven copper wire and bail.  This stone has multicolored spots including red. 

These stones are a variety of a silica mineral chalcedony and the red spots resemble blood which is how it derived its name.  From the Gemstone Encyclopedia we find that in ancient times, bloodstone was thought to be able to stop hemorrhages with the merest touch. Bloodstone is said to relieve stomach and bowel pain as well as strengthening blood purifying organs and improveing blood circulation. Bloodstone is also believed to have a positive influence on the bladder. 

This is a one of a kind pendant