this is Fernando of the RhinoGold team.
You can check the weight of gold, silver or other material with our 3D software for jewelry, RhinoGold.
In the picture below you can check in real time the weight of an Eternity ring
In this other picture you can check the weight on any object in real time by selecting it and look at the panel on your right
In the following 2 pictures you can have a look at how to upload your own material
If you want to have further info on RhinoGold 6.5, please feel free to contact me at firstname.lastname@example.org
I will kindly help you out.