Antique old mine diamond ring. Centrally set with a cushion shape old mine diamond, G colour, VVS2 clarity, with an approximate weight of 1.73 carats in an open back claw setting, to an elegant openwork collet with trellis details, curving claws and intricate backholing, flanked by trumpeting shoulders with diagonally set leaf motifs terminating in sinuous raised decoration and smoothing to a solid D-shape shank. Marked 18 carat yellow gold, circa 1900, accompanied by HRD Antwerp report #180000068375.