A Victorian citrine and diamond bangle, with detachable centrepiece, central claw set octagonal

A Victorian citrine and diamond bangle, with detachable centrepiece, central claw set octagonal citrine, approximately 13 x 11mm, surrounded by two rows of old mine cut diamonds, verso, a detachable threaded screw fitting for interchangeable centrepieces, pierced scroll detail set with old brilliant and rose cut diamonds, estimated approximate total diamond weight 1.90ct, mounted to three tapered bars, head dimensions 2.6 x 2.3cm, inside diameter 5.7cm, push-in clasp with figure of eight safety catch and safety chain, unmarked, tested as 9ct gold with silver settings, weight 22.4g