I'm trying to convince myself that I can still work with 3D (I am yet to be convinced of that). Anyway, this is just a quick and dirty job. As usual, models in Wings 3D, scene setup in Blender. What's unusual is that I'm rendering using Yafaray, since a new OS X build appeared on Graphicall today. That 'jewel' looks like glass. Ouch.
Wood texture from CG Textures, environment map from Aversis. Both textures are free.