According to the wiki;
[quote]When on a Craftable item,
a Colorless Augment Slot adds +1 to the item’s total enhancement value.
Red, Blue and Yellow slots add +2 to the item’s total enhancement value.
+6 stat ML 11
Masterful craftmanship ML 9
Yellow slot ML 11
So I took a lootgen ring with a yellow slot and disjuncted it, masterful craftsmanship on it, and put wisdom 6 on it.
ML should be 11 then. With the yellow slot effectively canceled out by masterful craftsmanship. Except the ML is 13. Masterful craftsmanship listed on the ring but not lowering ML. Oh well character is lvl 15 so not sweating it. I slot a Topaz of Deathblock into the ring, ML 12 and upon slotting it the ML of the ring changes from 13 down to 12.
EDIT: In before the ML is right b/c the Topaz is ML 12 so it raises it to the appropriate level. Yes I know it's at the right level but read closely, it was ML 13 with stat 6 and masterful craftsmanship on it. Slotting the topaz just corrected it.