How to make http://www.makehumancommunity.org/clothes/diamond_ring_01.html shine:
I assume that MHX2 is used for Blender import.
This is what the ring looks like after import:
Would you pay for this piece of plastic?
Select the ring and remove the subsurface modifier if there is any. The metal part of the ring is already subdivided. The diamond must't be subdivided.
Append the gold and diamond materials from the attached blend file to your file.
There are two materials for the diamond you can choose from.
Assign the gold material to the ring. Add a second material slot, assign the diamond material to this slot.
Tab to edit mode, select a diamond vertice and press Ctrl-l to select linked.
Assign the selected vertices to the second material slot. Set shading to flat faces.
Now it looks this way