It is good to know that you are not representing Diamond company, but please note that you do seem to be advertising it a lot. Why do you think that HEMA is better compared to what others offer? Do you know what are ingredients of Diamondbond and what other chemicals are in it? As far as Zirconia materials, you can get exact % of various materials included from the most manufacturers.
I might take your challenge on finding a better material. It is important to educate people that Diamond products have toxicity, as do other composites. We should all challenge manufacturers such as DRM that makes Diamond products to make more biocompatible materials. The change is starting and some of them are looking into biocompatiblity, but not at the rate they could be and but it is under public pressure and awareness that they will put more attention to bicompatibility in addition to other things they look first such as looks, cost, whether it easy to use and lasts reasonably long.