Two opal and diamond rings
Comprising: a ring set with a dark oval opal measuring approximately 13.2 x 10.0 x 4.0mm, millegrain-set with old round brilliant-cut diamonds around it, to a plain hoop with split shoulders, size K, stamped '18CT', maker's mark, dedication 'AUG to NLMcV 20/10/20'; and an opal ring, set with a graduated line of white oval opals, embellished with rose-cut diamonds, to a plain hoop, size M, stamped '18', British hallmarks and maker's mark (2)