Gems are an essential currency used in Pet Simulator X, and is used for several purposes:
- Pet Fusing
- Pet Enchanting
- Traveling Merchant and Mystery Merchant
- Unlocking Forsaken Gate
- Unlocking Trading Plaza
- Creating/Upgrading Bank Account
- Unlocking Teleports
- Despite being officially called Diamonds, many players call them Gems, likely due to being a shorter word and easier to type.
- Diamonds are the only currency that can be traded.