How Much Is My Ring Worth?

I have a ring from maybe ten years ago, it is blue topaz with a 10 karat gold band. It has no engravings on it, the stones are arraigned in the shape of a flower. The ring isn't very thick and it is very light. It is in good condition no scuffs,etc. Can you give me a rough estimate of how much this ring is worth, in Canada. Thank you in advance and please only serious answers.