A diamond and green enamelled brooch, early 20th centuryWith central claw-set old round brilliant-cut diamond, measuring approximately 3.20mm diameter x 2.15mm deep, within a petal-shaped surround and open borders of graduated smaller similar and rose-cut diamonds, also with green guilloché enamelled wavy border, with detachable brooch fitting and additional hinged suspension hoop, diameter 31.6mm, estimated total diamond weight approximately 1.50-2.00cts