How can I make nice looking gemstone/diamond material?

Questions
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1

I’m working on a project for a client which involves visualizing jewellery.

I’m just a bit stuck on how to make the diamond mateial look realistic.

I feel like updating the reflection map might help, but I also think that rending the backfaces would also help.

They are looking like this:
image

How can we make it look more like;
image

I’ve set up a playground example to show what we are currently doing:

Example Playground

2

It’s worth searching the forum for this topic as there’s been a bunch of great discussions and work shared about this exact topic.

E.g.:

But there’s more …

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