Dimond Ring

i’m trying to make a dimond ring and i just can get the dimond to look right, any one have any ideas of how to make dimonds ?

You could look at the gems at: http://www.3dlapidary.com/.

If you want to model it yourself, I would suggest you to find a good reference picture and use SpinDup -function described in: http://mediawiki.blender.org/index.php/Manual/PartII/Basic_Mesh_Modelling

This page is good for IOR values: http://www.3d-designer.dk/resource/ior.html