This small mod adds the ability to convert any of the 6 vanilla flawless gems to two of their flawed counterparts at the regular forge. 
A 1 to 1 conversion version is available.

I personally use this with [ Diamond Smithing Collection by UberSmaug ]: 
http://steamcommunity.com/workshop/filedetails/?id=92336732 

Cheerybelle's Micromods Nexus: https://www.nexusmods.com/users/8170278?tab=user+files&BH=1
Cheerybelle's Micromods Workshop: http://steamcommunity.com/workshop/filedetails/?id=242267049 
Cheerybelle's Micromods Drive: https://drive.google.com/folderview?id=0B6UjCHs3ScP9YU9BbWhvOC1fVWM&usp=sharing 

Ported to Special Edition as an all-in-one single-ESP compilation: http://www.nexusmods.com/skyrimspecialedition/mods/10445/?