An unusual enamel mourning ring, late 18th century, centring on a glazed oval panel containing

An unusual enamel mourning ring, late 18th century, centring on a glazed oval panel containing hairwork on vellum in the design of a tree with a broken branch, the reverse engraved with the initial B, to a wavering band applied with white enamel, with foliate designs and the inscription 'HOPE IS NO MORE' in reserve, mounted in gold, size K