Two tone rings (gold plated tungsten) with a center green sapphire and diamonds. (Modeled in Rhino, Nurbs)
Inspired by a piece which was part of a jewelry found in the Titanic. Some elements were changed as well as the method of assembly as in this case the round pins are used to hold the garland-cage in place which itself holds the diamonds.
Another studio shot of this ring.
Luxuriant ring 
What render engine do you used?
Bella render.