The Chat Gem is one of the strangest Mythic items in Diablo 4 Season 15. Unlike regular gems, it doesn't provide combat bonuses. Instead, it triggers unusual messages in your in-game chat as a nostalgic reference to Diablo 2.
Want to get your own Chat Gem? You'll need to find a special Waking Nightmare portal called Diablo Hellfire: The Cornerstone. This guide covers how to find it, obtain the gem, and use it.
What Is the Chat Gem in Diablo 4?
The Chat Gem is a mysterious Mythic Gem introduced in Diablo 4 Season 15. It is a nostalgic Easter egg inspired by the original Diablo 2 Battle.net lobby, where players could click a small blue gem to trigger funny chat messages.
In Diablo 4, this classic joke returns with unusual messages and mysterious number sequences, making the Chat Gem an interesting collectible for longtime fans.
How to Use the Chat Gem in Diablo 4
The Chat Gem can be socketed into jewelry, including rings, amulets, and Leoric's Crown.
To use it, follow these steps:
- Choose Your Equipment: Find a ring, amulet, or Leoric's Crown with an available socket.
- Socket the Gem: Open your inventory and insert the Chat Gem into the available socket.
- Check Your Chat Window: Once equipped, the gem becomes active and periodically displays random messages while you play.
Some messages you may encounter include:
- "Chat Gem Activated"
- "Chat Gem Deactivated"
- "Perfect Gem Activated"
- "Mooooooo"
It may also produce strange monologues about Hell and mysterious numerical sequences.
Despite its Mythic rarity, the Chat Gem currently has no confirmed combat bonuses or stat enhancements. Its main purpose appears to be entertainment and nostalgia, although players are still investigating whether its messages contain hidden clues.
How to Farm the Chat Gem in Diablo 4 Season 15
The Chat Gem drops from a special open-world Waking Nightmare encounter called Diablo Hellfire: The Cornerstone. The portal appears randomly in Sanctuary, with Helltides being a useful place to search.
Follow these steps to find the portal and obtain the gem.
1. Farm Open-World Events During Helltides
Start by entering an active Helltide and participating in open-world events.
Based on farming experience, events connected to Whispers are particularly effective.
To find them:
-
- Open your world map during a Helltide.
- Look for pink event icons with a small triangle inside.
- Prioritize these Whisper-related events.
- Move between available events instead of repeatedly farming one location.
This is currently a recommended farming route for finding special seasonal encounters.
2. Hunt Treasure Goblins and Hellborne
While exploring Helltides, look out for special enemies such as:
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- Treasure Goblins
- Hellborne
- Other unusual seasonal enemies
These encounters are worth checking while farming for the Cornerstone portal.
World Bosses were previously another farming option, but this method appears less effective following reported changes. Based on the farming experience in the video, open-world events are currently the preferred approach.
3. Find the Diablo Hellfire: The Cornerstone Portal
Continue exploring until you find the special portal named Diablo Hellfire: The Cornerstone.
Make sure you enter the correct portal. Season 15 features several Diablo-themed Waking Nightmare encounters, but the Cornerstone encounter is the one associated with the Chat Gem.
4. Interact With the World's Cornerstone
Inside the encounter, look for the central interactive object called the World's Cornerstone.
Approach it and interact with it to claim the available rewards. The Chat Gem has a chance to drop directly from this interaction.
Some players have reported encountering an additional enemy after interacting with the object and obtaining the gem after defeating it. However, this does not appear to be a confirmed requirement, as the gem can also drop directly from the interaction.
Pay attention to the familiar Mythic drop sound and check your loot carefully.
5. Repeat Until the Chat Gem Drops
The Chat Gem is not guaranteed every time you complete the Cornerstone encounter. You may need to find and interact with multiple Cornerstones before obtaining one.
Keep farming Helltide events, prioritize Whisper-related activities, and repeat the encounter until the Mythic Gem drops.
