Jewellery rendering

[Holo]

Maxwell render is a good choise:
http://www.maxwellrender.com/index.php/gallery/images/7/2/287

Or V-ray
https://www.google.no/search?q=vray+jewelry&espv=2&biw=1920&bih=1094&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiuv6enpaXPAhXKZpoKHZxIAEsQ_AUIBigB

Or Keyshot:
https://www.google.no/search?q=vray+jewelry&espv=2&biw=1920&bih=1094&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiuv6enpaXPAhXKZpoKHZxIAEsQ_AUIBigB#tbm=isch&q=keyshot+jewelry

And check this thread:

Which renderer for Rhino?

It’s probably been asked many times, but I couldn’t find any recent reply (all before 2008). We use Rhino 5, 64 bit, and we currently use vray. Their choice of using a usb dongle (located on our server) is a pain in the neck, I cannot render when I take my laptop home, and vray checks for the license every time you hit a button, if the network is slow or congested that means freezing or crashing Rhino. Furthermore, vray for rhino documentation is hilarious. vray 2.0 has benn out for a year and…

It all depends on what you want to spend, what system you have and how long you are willing to fiddle with the rendering.