More natural results with mix of Glasses, Liquids and Gems (see exemples below)

[elliasp]

Hello,

As you can see on photos below, I tried many shots and mixes between materials to have the perfect "ice cube" result.

Everything is doing fine but when I put 3 transparent materials (liquid, glass or even gem), the final result is... black.


Maybe you can give me some advices ?...   

Moreover, the last pic is showing you an exemple of what could be enhanced in the material editor...

Thx !

+++
Fran