Gold ring with topaz, sapphires, and diamonds

18k white gold with ruthenium application, set with blue topaz surrounded by sapphires and diamonds.
No. 01 blue topaz approx. 5.00 ct.
Corundum variety sapphires, round shape, composite cut, approx. 30.00 ct.
Round brilliant cut diamonds approx. 1.60 ct, G-H, VVS.
Front size 38 x 35 mm. Weight 36.5 g.
IT size 14 - US size 7.
Conservation status: ***** excellent (like new).