Overall, it's a nice composition. The gems bother me, though. They look milky (a lot like fluorescent plastic), where the originals were decidedly clear. The glow also escapes from the gems into the surrounding area without sufficiently illuminating the surroundings to account for that level of illumination. It feels a lot like what happens when you take the UV filter off of a camera and film under a black light in addition to regular light. There's a lot of illumination on the scene that doesn't match with the expectations of our normal-illumination experiences.

Rather than a diffuse glow, maybe use a small (no more than 50 or so) swarm of point lights on the interior of each gem? I'm not sure how you'd go about modeling that, though. With a swarm of illuminators and possibly a small amount of scattering on the interior of the gems, you could possibly get an effect that would be interesting.