Very nice
This is excellent work. I love the glow, the font, the theme, and the feeling. The criticism I offer below is only meant to be instructive, and should not take away from the fact that I really enjoy looking at this image!
Comments:
If you want a more realistic diamond, do three things: (1) put facets (polygons) on the inside, (2) give the specularity some color-noise to simulate the prism effect of splitting white light into its components, and (3) make the specularity HUGE so light really shines on the surface.
The chocolate material is nice, but the specular color should be browner.
(Nit picky) The chocolate droplet on the box is great, but it would better if the liquid "came up" to the edge of the chocolates due to surface tension. However, I'm a scientist so I look for that sort of thing, and it probably isn't the best use of your time to model it.
Great stuff!