This is a classic Art Deco add-a-diamond band engraved from 1931, set in 18k white gold.  Fourteen single cut diamonds, each bead set in their own little box, sweep a little over halfway around this 2.5mm band.  Engraved "A.H. to A.H. 3-21-31".  Currently a size 6.25 and can be resized as needed (please note sizing down will partially remove engraving).  This vintage ring is solidly made and very sparkly--substantial enough on its own or stacked with an engagement ring or other bands!