1940s American diamond set globe ring in platinum

1940s American diamond set globe ring in platinum. Centred with a domed circular form decorated with round Old European cut diamonds in grain settings, fitted across the top of the cluster with two rows of square and rectangular baguette cut diamonds in channel settings, to an impressive planetary cluster with polished borders and structured finish, met to either side with broad split shoulders that curve to a solid shank. Marked platinum and iridium, American.