If I may, I would personally try to make the gold/brass and gem parts have a more shiny/metallic material. Right now it all looks a bit samey. If the blocks at the top of the crate are meant to be copper, it should be more reddish and metallic too.
All of the items could probably do with a little more detail, such as nails holding the crate together, or more complex shapes for the top and bottom of the pillar. I don't know at what scale those things will be shown though.

Anyway, just my two cents.