This is a stunning bright blue Japanese saltwater akoya cultured pearl & white gold necklace. 

The pearls are a medium blue/gray color.  They have light rosy pink overtones and good luster. Quite a few natural blemishes. Some variation in color and luster. Very slightly baroque and graduated. They measure from 6.00-6.50mm.

Clasp is fishhook style with two small white pearls set on top. It is stamped "750" for solid 18K gold. Total length is 19 inches. 

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