JEWEL and CRYSTAL are DFK's primary tokens, used for many in-game transactions. When you deposit them with the Jeweler, you receive the "x" version, which is DFK's governance token. This means that xJEWEL and xCRYSTAL holders, along with Hero owners, can participate in votes on project policy, when they are called. Holding xJEWEL or xCRYSTAL is sometimes a qualifier for community airdrops and other rewards.