This is a stunning black and white Japanese akoya saltwater cultured pearl four strand bracelet. 

The pearls are 4.75-5.00mm and round. There are two strands of white pearls with rosy overtones and two strands of black pearls with iridescent overtones that range from green to blue to maroon. Very stunning piece. 

It is set in solid sterling silver and is stamped "STERLING". The clasp is stunning and has three pearls set in the center and is surrounded by hand engraving. Total length is 6 3/4 inch. It has a safety lock. 

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