a diamond brooch/pendant, early 20th centuryWith central millegrain rubover-set old round brilliant-cut diamond, measuring approximately 4.5mm diameter x 2.8mm deep, within two graduated open-circular borders and surmounted by a bow-tied ribbon motif, set throughout with graduated similar and rose-cut diamonds, with detachable brooch and bow-form pendant fittings, measuring approximately 33 x 22.7mm, estimated total diamond weight approximately 1.50cts