This is a cute petite Japanese saltwater akoya cultured pearl heart pendant. 

The pearl is 6.00mm and lustrous with bright rosy overtones.

It is made of solid 10K yellow gold and features a simple heart design. It measures 3/4 inch total, it is a petite piece. It is stamped "K10" on the bail. From Japan 1930's-1960's.

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