These are a vintage and completely authentic pair of Mikimoto Japanese akoya saltwater cultured pearl screwback earrings. 

The pearls are highly lustrous with rosy overtones and measure 5.00-6.50mm. They are set among detailed round ribbon details.

They are made of solid sterling. Stamped "M" in a clamshell for Mikimoto and "S" in a square for silver. Measure 5/8 inch high. From Japan 1940's-1970's.

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