Vintage 925 italy Black Crystal necklace 20" drop

A large black faceted crystal made in italy . The chain is adjustable with 2 " or 5 cm . It has a 20" drop at full length. The crystal has an oval shape and is 1 1/4 "long and approximately 1 " wide. It is accented with 6 marcasite stones above . The marks are clear and on the ends of the chain and the clasp and the back of the pendant is marked 925 and th . a box comes with it .