That material looks like it would need a good texture in the color channel that tiles and then an adjusted version of it in the reflection channel. The environment and other light sources would be very important as well.
So the first step would be to make a good texture map in my opinion. You might also want to ask for opinions on the Rhino user forum here... https://discourse.mcneel.com/
Nils, I too am a jeweler when I need a true looking gold I use the gold that is in the materials available on thin forum. I downloaded all of these materials and have them saved on my computer. I believe Brian James made all of these materials and thank him for his work. Here is an image of a ring rendered in high carat gold.
All my best .... Danny
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