The Oistos "Arrow" necklace is cast in silver and is on a 2.3mm silver rolo chain. The Oistos is 16" in length so it wears higher on the neck line. 

Oistos (Οιστος) is the Greek word for arrow, and the ancients' name for the constellation known today as Sagitta, the Arrow.  This small constellation, clearly the shape of an arrow pointing away from Hercules beside Aquila, the Eagle, and flying more or less towards Cygnus, the Swan, can be seen in late summer in the Northern Hemisphere.  The ancient Persians, Hebrews, Arabs, Armenians, Greeks, and Romans all saw this group of stars as an arrow.