I'm getting about 25% success rate with q50 gems, are you saying higher quality gems will work better? If that is the case it would be nice if there were some way to improve them before enchanting as digging them from the ground does not increase the gem quality much at my 39 mining skill and that skill does not increase very fast. At that success rate I'm not going to /dig the gems because I will need so many to make it cost effective. My magic skill is also relatively low with crystal way the highest around 76. it is nice that gem enchanting will help boost my magic skill faster than endless casting.
I do wonder why this was implemented before gem cutting as I would expect that to be a prerequisite skill, however, it is nice to have new things to try.