*.p2m material libraries out there?

Hi,
I'm looking for p2m file libraries in the subject of different precious gem
stone materials, diamond material, and precious metal materials.
I'm trying to learn photworks and find it difficult to get along with the
supplied materials (actually I never managed to get a long with any of those
rendering packages, so you can guess I'm pretty frustrated from this). my
task is a little difficult (at least to me): I need to render an jewellery
assembly of a ring which is made of two parts: one made of polished gold the
other one is made out of titanium. the gold one has a bezel in which there
is a part made of a square diamond. the rendering should look like the ring
is floating in the air (no background, and no shadows from the ring on its
surroundings). the rendering should convey the reflections of the polished
gold and the diamond together with the refraction and translucency which is
appropriate to a diamond.
I would love to hear any advice from any of you guys including the
photoworks gurus.
Thanks,
Gil