Antique 18ct 750 Yellow Gold Ring with Opals & Diamonds Size J 1/2 3.9 g

We are selling an antique 18ct 750 yellow gold Ring set with Opals and Diamonds. With Birmingham hallmarks.

The UK size J 1/2, the US size 4 3/4. The diameter is 15.5 mm.

The central opal measures 6 x 4 mm