Opal and Diamond Jewellery A charming pendant and earring set having a 16.6×11.5mm oval opal with good play of colour and an estimated of weight 5.3CT with 6= 0.01CT diamonds. The two earrings being set with oval opals 9.7×6.9mm with good play of colour and estimated weight of 2.25CT with each earring having 3= 0.01CT diamonds.