A lighter stone can actually be helped by a an "enclosed" bezel. Yours looks well cut with a lot of light return so top lighting should be adequate, imo. A darker stone that is overly deep or shallow would benefit from some light behind it. Family member in another state has a stone like yours or even lighter that is fully bezel-enclosed and it's very bright. You do have to clean behind it regularly, though.
Edit: not an expert
Edit: not an expert