Antique gold ring with opals and diamonds

An English gold ring in 18 carat gold set with three oval cabochon-cut opals with four old-cut diamonds in between. With old English hallmarks on the strap. The opals are 10.5 x 7.8 mm and two times 6.0 x 4.5 mm, the diamonds weigh approx. 0.40 ct together.

England, ca. 1900