Am I missing something? trying to make a runeword

Threads that no longer serve a purpose. Read-only.
egboy
Prowler
16 | 0
Im trying to make the rune word Chthon. I have a 6soc bonesplitter base. I put 5 gems then the Sur rune and it doesnt make it. am i missing something?
WarzZ
Imp
4 | 0
You need to use jewels instead if gems