Blessed enhancement stones increase chance of success by 5% (approx), while lucky enhancement stones provide a 5% chance to upgrade your weapon by 2 points instead of one. However, they also reduce chance of success by 5%.
__________________
Credits to Loveless for the great signature!
We rode on the winds of the rising storm
We ran to the sounds of thunder
We danced among the lightning bolts
And tore the world asunder
yup, so if you have all 3 enhancment fiesta store items (red eye, blue mile, and the other yelllow thingy) then you should use a lucky enhancment stone to enhance something faster