An absolutely magnificent black opal and diamond cluster ring mounted in platinum. Art Deco ring circa 1925 set to centre with an opal weighing approximately 13.00 carats, in a six double claw setting. Set to either shoulder with a close set baguette cut diamond, remainder of diamond border is made up of twenty-six ‘eight cut’ stones in grain settings. The play of colour in this opal is outstanding. Berganza.