An opal and diamond set cluster ring centring on a four claw set, oval shaped, cabochon cut white crystal opal measuring approx. 6.70mm x 5.85mm x 2.77mm deep and claw set in white metal. The opal is calculated to weigh 0.64ct, having translucent body colour with strong green/blue and minor red/orangle play of colour. A surround of alternating groups of claw set brilliant cut diamonds (20 in total and measuring between 2.00mm-2.30mm diameter) and baguette cut diamonds (four in total, each measuring 4.00mm x 1.30mm) to a three tier raised cluster head measuring approx. 14.70mm x 14.60mm.  Estimate brilliant cut diamond weight is 0.72ct with colour and clarity assessed as H-J and VS2-SI2.  Estimated baguette cut diamond weight is 0.24ct with colour and clarity assessed as G-H and VS-SI.  White metal band stamped "18ct" and testing as 18ct white gold. Age assessed as circa mid-20th century.  Finger size 7 (US/Canada), O (UK/Australia) with some resizing possible which we wouldl carry out in our own jewellery workshops.