Hello,
I started a new post about diamonds as in the first one I started asking different questions about lights, shadows, etc.
So I made a new tread just for this.
I set up the node material, and I’ll keep updating this.
I didn’t study programming in Uni (I studied art), so I may be slower than real programmers to grasp the concepts… but I started using Babylon exactly two days ago… so I am quite proud of my progresses.
This is the playground.
https://playground.babylonjs.com/#FEEK7G#331
The node setup is linked inside.
If you like to follow, play with it or ask questions it would be great, so I can also benefit from the answers 
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Thank you!!!
I have to say I have been helped a lot!!!
I hope that slowly I manage to make a nice shader and help other newbies!!!
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I just wanted to share the progression… (is quite small… I know… but I had to watch tutorials etc )
https://playground.babylonjs.com/#FEEK7G#338
I am working on making the diamonds iridescent… then I’ll be working on creating transparency and refraction…
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This is pretty good already!
I have been watching the tutorial of @PatrickRyan on the creation of a die made of acrylic.
The technique is really cool also because it generated the back of the material. I think that the same technique can be used to generate the extremely refractive material of a diamond… Together with an iridescent material, it could work really well.
At the moment the problem is that the rgb channel mix just in the last lerp… so basically the one I posted shows blue and green shades.
Also I used the normals of the world to make sure that each face reflects in a different colour… but it is not the right node in my opinion… it should be something that reflects a particular colour depending on the tangent from the camera I guess
P.S. I am still learning them… so probably I didn’t encounter the right node yet…