|“||Gem Level Up Booster. This lucky charm prevents Cracking and gives 40X Level Up chance and 10X Double Level Up chance!||”|
— Item Description
The booster prevents cracking while levelling up gems, and gives a gem a 40X Chance Level Up chance and a 10X Double Level Up Chance. It can also be obtained from contests if you have qualified for certain ranks. Usually, when used, it gives a guaranteed level up (with a very low chance of failing on higher levelled gems).