In astronomy, the meridian is the line on the celestial sphere joining the observer's zenith with the north and south poles. The Meridian Set is made up of three bands including 1 2.5mm wide three-line ring, 1 4mm silver densa ring and 1 2.5mm wide gold stacking ring. This stack is available in our signature round and square shapes. Special note: Because of the width of our stack ring sets, it is recommended to buy a stack that is approximately a half to a full size larger than your normal ring size. Materials: 14k gold-fill (14k gold over a brass core/no nickel), sterling silver (.925), and oxidized sterling silver. All materials are hypoallergenic.This ring is designed in Asbury Park and handmade in our Upstate New York production studio.