This is a wonderful Estate Necklace. It is 16" long with a very large and impressive Edwardian clasp. It has a green Tourmaline stone. The bright green stone is 5 mm. Choker length necklaces are all the rage and with would be a unique one! The Pearls are well matched and great at 7.25 mm each. The double clasp is marked 750 for 18K white gold and is 1 1/4" end to end.