This is a 3/4 inch Herkimer Diamond that has been netted with silver wire.
All wire wrapped and netted necklaces include a chain or cord so that you can wear it right away. The bails (the part where the chain goes through) are large enough that you can change the chain for a different look. The chains/cords are 16 inches long with a 2 inch extension.
Gemstone, Herkimer Diamonds, New York