joined by metal hardware in the shape of a figure 8

It fastens at the center back with a clasp

where there is also an extra length of chain with a small shell pendant attached to the end

Also check out Gemstone Butterfly Earrings Sterling Silver Gold

Puffed Mariner Chain Necklace Gold 14k-gold-earrings joined by metal hardware inThis necklace is made from stainless steel plated in 18 karat gold and is comprised of chunky, oval shaped puffed mariner chain links which have two holes in each link, joined by metal hardware in the shape of a figure 8. It fastens with a spring clasp and extension chain at the center back. Versatile, adjustable, and timeless, this gold necklace will be a workhorse in your jewelry collection.