Diamond coronet cluster ring. Set centrally with one round old diamond in an open back claw setting, K colour, VS2 clarity, with a weight of 1.68 carats, encircled by twelve round old cut diamonds in open back claw settings with a combined approximate weight of 1.20 carats. The total approximate diamond weight is 2.88 carats, to an impressive coronet cluster featuring curving claws, an intricately pierced gallery and fancy open backholing, leading to inwardly tapering shoulders with chenier detail that flowing through to a solid D-shape band. Marked 18 carat yellow gold and platinum, early 20th Century, accompanied with a Gemmological Institute of America (GIA) report #2233761442.