This is an antique art deco Japanese cultured saltwater akoya pearl triple strand necklace.

The pearls measure 3.25-8.50mm with good luster and light rosy overtones. Light amount of natural blemishes. 

The clasp is solid sterling silver has a single pearl in the center. It has wonderful hand engraved details and is good quality. Not stamped but tested for for sterling silver. Total length is 16.50, 17.50 & 18 inch. From Japan, mid-century or earlier.

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