Regarding #6... I would like this design even better if the medal had an even stronger metallic or chromatic appearance. One example is
http://www.slicktutorials.com/ps/chrome/10.gif This is just an example though and I definitely leave it to the creative experts' judgment to suggest the best approach. Additionally, I'd like to see more of an embossed effect on the medal, as if it were stamped out of gold, to see how that might work with the design. Lastly, I'm curious how the word 'Medallurgy' would look if it too were metal (black metal?) or perhaps a bit more prominent. I am least certain about this last comment so it is more of a speculation than a suggestion. It may just be too much metal if we did that.
Overall, this is a clean design, serious, and strong... all things consistent with our brand.