- Gem Perfection
- Passive
- Gives the Jewelcrafter the chance to cut uncommon quality Northrend gems into perfect gems.
Gem Perfection is a passive trait exclusive to Jewelcrafters. It gives a chance when cutting uncommon Northrend gems to cut it into a "perfect" gem, slightly raising its stats (by 15% or more).
Source
Once you have 350 Jewelcrafting skill, you will be eligible for the starting quest offered by any of the Northrend starting area trainers:
[70] Gem Perfection (Valgarde)- [70] Gem Perfection (Valiance Keep)
- [70] Gem Perfection (Warsong Hold)
- [70] Gem Perfection (Vengeance Landing)
[70] 
[70] Notes
The exact proc rate for this skill is still unknown because of insufficient data. However, initial findings estimate the proc rate to be 10-20%.
For example, one crafter found a 19.64% prefect cut rate out of a random sample of 112 gems. [1] However another user broke it down by further and found significant differences. 41/229 Balanced Shadow Crystals were perfect - a rate of 17.90%, while 
[Glowing Shadow Crystal] only 13/133 or 9.77% were perfect, and for [Purified Shadow Crystal], only 11/90 or 12.22% were perfect. Overall this second sample comes to an average of 14.38% proc rate.
Patch changes
Template:Patched