This is a stylish mid-century modern Japanese akoya saltwater cultured pearl leaf pin by Beau.

It features two pearls set in a minimalist setting. They have good luster and rosy pink overtones, they measure 5.75-6.00mm.

It is in solid sterling silver and is stamped "STER" and "BEAU". It measures 2 1/4 inch across. From mid-century. 

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