Woodbridge Antiques has dated this piece to the 1930s.

A particularly beautiful ring, the diamonds are lovely and the style is gorgeous circa 1930's.
Condition: In lovely condition.
Marked: 18ct gold by C.L.M. Circa 1930's
Measurements:

Ring size R
Central diamond measurement: 3.2 mm diameter. Width across setting shoulder to shoulder: 1.4 cm
Width of band at base: 2 mm
Weight: 2.4 grams
Weights and measurements are approximate.
Woodbridge Antiques has dated this piece to the 1930s.
Specialists in quality antique silver, fine jewellery & accessories
You can view the stock and full dealer information on the Woodbridge Antiques Profile Page