Platinum, marked Pt.850. The oval, dark opal of fine blue colourplay in high chatonsetting (approx. 12,5 x 11,5 mm). In prong and bar settings with 16 diam. in trapez cut and 46 diam. in round brillant cut in total approx. 0,94 ct. G-I.vs-P. Ringtop 21 x 20 mm, size 55, weight approx. 10 g.