Vintage opal and diamond cluster ring

A vintage 18 carat gold ring with a cabochon opal in a single cut diamond cluster. The ring is hallmarked for London and the year 1963. 

The opal measures 10 mm by 8 mm and is a around a 1.60 carat stone. The diamonds are .18 carat in total, VS in quality and H in color. 

The ring size is 18.50 mm, the size can be modified if necessary. 

There is a chip to the opal beneath one of the white gold prongs. Otherwise the ring is in good condition and the opal is a vibrant lively stone.