18 ct. white gold, marked. The high ringtop with one light blue, natural Burma sapphire in cushion cut approx. 25,99 ct. (approx. 18,65 x 14,15 x 11,60 mm). On the sides 6 diam. in trapez cut in total approx. 0,40 ct.H-J.vs-P. Size 55, weight approx. 12 g. Details about the sapphire according to the reportof C. Dunaigre of May 2018, 'No indications of heating'.