Quote - Acadia I just downloaded that prop and I'm so sorry to tell you but you're wasting your time.

That tiara doesn't have the shapes of real diamonds at all. The back is flat instead of having a cone shape made of facets. And the front of the stones only have 7 facets - a real diamond has over 50 facets on the front and without those facets any "physics" based simulation of light is not going to make them look like diamonds. They're going to look like flat pieces of bevelled glass.

I noticed that the prop actually comes with a diamond photo texture - I suggest you use it for this prop. If you like, you can still improve the original as I've done here. A proper specular highlight size, and some fresnel effect reflection helps improve them - I think this looks fine.

Yes, the one you did does look great!  When I tried using the texture that came with the tiara all I got were stones that looked like ugly pearls, nothing like a diamond at all.

I'm going to use your set up and save it as a material set for future use, thanks so much :)

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi