Crystal material in blender

Hi anyone, i'm experimenting with a crystal material (in Blender) that i'm going to use for an upcoming project...
the material is 100% procedural, no textures, and i'm using Cycles with Lukas Stockner's denoising build, which in this case is really faster and handles caustics quite well...
https://blenderartists.org/forum/showthread.php?419704-The-latest-additions-to-cycles-has-made-it-nearly-real-time-in-certain-scenarios

It is getting close to what i'm looking for but still half-WIP, so suggestions and comments for improvement are most welcome...

thank you all for passing by, and have a great weekend!