Thanks! I've gotten a lot of hdrs from hdrihaven. Great resource. Anyway, yesterday I DID use an HDRI map to light it, but it was hopeless. So today I tried your mat (AND I finally screwed my head on straight and looked for a diamond object in freestuff and found a good one!). I used the Superfly Loop lighting with an HDRI. (Tried it without the lighting and it looks kinda the same, only slightly darker.)

The diamonds have a lotta colors, so maybe I should double-check the mat setup, but, at least, they look like diamonds instead of blue glass now! Thanks so much.

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W11,Intel i9-14900KF @ 3.20GHz, 64.0 GB RAM, 64-bit, GeForce GTX 4070 Ti SUPER, 16GB. 

Old lady hobbyist.

All visual art or fiction is "playing with dolls."