This is a cute retro marcasite bow charm/pendant set with a single Japanese akoya saltwater cultured pearl.

The pearl is 7.50mm round. It has great luster and rosy overtones. It is a cream/yellowish color. Like antique lace. 

It is made of solid sterling silver and it is set with numerous marcasites. It is stamped "925" and two more marks I cannot make out. Total drop is 1 1/4 inch including the bail. 

All pearls are truly vintage and have only been lightly cleaned.