When you reach a certain level and have obtained gears that allow gems to be equipped, these gems give you stat boosts.

All attribute stats: Str, Dex, Int, Agi , Luk, Sta

Gem synthesis: Obtain 3x same attribute gems (e.g 3x Level 1 Str gems can be fused to 1x Level 2 Str gem)

Level of Gem Attribute Bonus Zeny required to fuse to respective levels L1 gems needed to get appropriate gem 1 +3 - 1 2 +10 10000 3 3 +30 40000 9 4 +80 140000 27 5 +170 420000 81 6 +310 1050000 243 7 +500 2100000 729 8 +750 4200000 2187 9 +1100 16800000 6561 10 +1600 67200000 19683

Attribute bonuses per level of gems as follows:

Slot number for equips is as follows (Not confirmed):

Slot Item level (ilevel) Rarity 1 Lv 74 Purple 2 Lv 124 Purple

3rd slot is only available on Red rarity equips AKA legendary slot, only for legendary gems (upcoming).