Thank you for this mod! It is really cool!
Using latest forge 14.21.1.2387, if I try to open inventory and press "Recipe" button (new 1.12 vanilla feature), I get crash. I double checked, it is from SilentGem+SilentLib. Crash report doesn't indicate it is from this mod, but nothing else is installed. I tried with other mods, no crash.
crash-2017-06-29_10.08.56-client.txt

Confirmed, I'm also crashing with the latest Forge. Might take some time to figure out which recipe(s) are at fault.

Seems I was registering most recipes twice. Not sure how that caused this kind of crash, but it's fixed.