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

The pearls are highly lustrous with rosy overtones and measure 4.00-6.50mm. They are set among hand engraved leaves and milgrain details. 

They are made of solid sterling. Stamped "M" in a clamshell for Mikimoto and "S" in a square for silver. Measure 7/8 inch high. From Japan 1940's-1960's.

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