An early 20th century diamond and basaltic sapphire toi et moi ring, An early 20th century diamond and basaltic sapphire toi et moi ring, the old cut diamond and cushion shape Basaltic no-heat sapphire duo with single cut diamond band, estimated total diamond weight 1.40cts, principal diamond estimated weight 1.35cts, estimated colour J-K, estimated clarity SI, stamped PLAT, ring size N1/2, gross weight 3.8g.