AgAu Jewellery has dated this piece to the 1950s.

The ring is size L - M (U.S size 6) with an internal diameter of approximately 16.4mm. The diamonds have been tested and it is hallmarked for 18ct Gold. The total weight of the ring is approximately 2.0g.
It would make a stunning gift, xmas present or engagement ring and is rather exquisite with a beautiful sparkle and makes a lovely statement. It is a vintage item and there may be marks commensurate with its age (please see photos or ask questions for more details
AgAu Jewellery has dated this piece to the 1950s.
Agau jewellery offer an extensive range of 9ct and 18ct gold jewellery.
You can view the stock and full dealer information on the AgAu Jewellery Profile Page