This uniquely shaped pendant was made using the cuttlefish casting method, provides a small border of silver around the sea-glass centerpiece.
Cuttlefish casting is an ancient technique that allows the casting of basic shapes without the cost of expensive mould materials. Cuttlefish wash up on the shores all the time, all thats left when found on the beach is a white oval shape with a soft side and a hard bony side.
Sea glass is physically and chemically weathered glass found on beaches along bodies of salt water. These weathering processes produce natural frosted glass. "Genuine sea glass" can be collected as a hobby and can be used to make jewelry. Sea glass takes 20 to 30 years, and sometimes as much as 50 years, to acquire its characteristic texture and shape. (excerpt from Wikipedia)