This is a lovely textured vintage Japanese akoya saltwater cultured pearl leaf pin by Wells.

If features one pearl and delicately detailed leaf motif. The pearl measures 5.75mm and good luster with rosy overtones. 

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

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