Gem can be embedded in the game Only items with slot are eligible for embedding.
Now only weapon and armour can be slotted at present. Accessory is not allowed to slot. Weapon can have three slots while armour can have just one slot.
Enter the Armory in all main cities, choose the Slot function to open the interface. Drag the item to corresponding place, a light blue color will appear if it is allowed to slot.
Each slot requires gold or gift coupons. You can move the mouse to see the effects after slotting.
You can obtain Free Slot Creation Stone in the game for free slot. Free Slot Creation will be used first. You'll need to pay gold or gift coupons when free slot time becomes 0.