This is a Very Pretty Delicate Vintage Sterling Silver with Onyx and Marcasite Pendant Necklace.
The Sterling Chain measures 18" and the Pendant is 1 1/4" with bale. The Pendant is Marked 925 A and the Chain is Marked 925 Italy A.
The Necklace is in Very Nice Condition, I have left the Patina.
Sterling Silver Marcasite Onyx Pendant Necklace