How much would this gem be worth?

Question

It is faceted into an oval shape and the flaws are light blue and very small. There are no occlusions.

Answer 1

I think you mean "inclusions".

Anyhow, it depends on what them gem is. Blue topaz isn't that valuable whereas a Ceylon sapphire can fetch a lot. Colour is never a good identification property. Take it to a certified gemologist or jeweler and they can tell you.