This 10 karat gold vintage ring has an unusual asymmetrical design and would seem very much at home on the finger of a woman in a French rococo parlor of the 1730'3-1760's. Decoration during the Rococo was used to create a sense of flow and movement with abstract and asymmetrical details often in the form of wave like lines and the use of scroll work. The style loved natural forms like rocks and rivers. The Baroque style which came before and ran concurrently used highlights and shadows to create drama and the Rococo loved the play of light , but took an approach that accentuated the delicate rather than the robust.
This ring has so many of these Rococo elements at work. The lines that flow across the front of the ring have deep shadows and glinting highlights that give the band the feel of a swiftly running river. The design is quite asymmetrical, but completely unified and well balanced. Overall the ring is delicate and feminine especially with the use of the single-cut, round prong-set 2.15 mm diamond.
The ring has markings, but the only letter I can make out is an "N". It tested as 10 karat gold.
The ring weighs 1.2 grams and is a size 8 US. There does appear to have a minute nick on the girdle of the diamond. It can only be seen through a loupe and even then it is hard to see. That being said, all else in in great vintage condition.