gold ring with a rose cut diamond and emeralds

An 18 carat gold ring with a large rose cut diamond (app. 1 carat) with 6 table cut emeralds around it (also app. 1 carat) in closed setting, circa 1760, England.

ring size: 16.75 mm / 6 ¼ US
weight: 3.13 grams
top dimensions: 13 x 12 mm