A very pretty setting on this vintage estate ring circa the 1940s.  A simple scroll with claw-like prongs hold the oval onyx stone in place.  The setting is feminine and delicate and the stone is an elongated oval.  There is a marking on the back of "10k" with the letter "H" in a circle.  The original stone has a small scratch-like flaw that can be seen in the upper right of the main picture.  Size US 4 1/2. See the chart conversions for international sizes.

View of the side: