Vintage Sterling Silver Black Onyx and Marcasite Bracelet. This Bracelete features 12 Black Onyx links studded with Marcasite stones. The glittering bracelet show cases rounded rectangular Black Onyx pieces encircled in Sterling Silver bands that are bejeweled with 23 faceted Marcasitesin each one. This was a popular design in the Art Deco era! Bracelet is 7 1/4 inches long and the black onyx are apprx 3/4 inch long by 1/4 inch wide.