Oh Boy You are Amazing !!!
A Gorgeous Two Tone Blue Topaz Designer Ring in Sterling Silver and 9ct Gold -See photos showing you more detail and design on this one magnificent piece -marked accordingly 925 Sterling Silver and 375 for 9ct Gold -The ring is attributed to the Designer Susan Roos

Dimensions: The Ring has a inner diameter of 17.45 mm -That would be a ring size N and a half -The top width of the band is 2.2 cm ( Code G23R103)