14K Yellow Gold Caliber-Cut Diamond Mystery-set Black Enamel Vintage Ring 

Size 6.5

Set with dramatic black enamel in the recessed areas of the ribbed shoulders

Weight 4.8 grams

The face measures 6 mm North to South, the center is elevated 3.5 mm above the finger

Diamonds: count 22, approximate total weight 0.50 ctw (estimated in the mounting) 

Stamped 18K