In expansion The Echoes of the Atlas introduces 3 new types of craftable Watchstones:

  • Chromium
  • Platinum
  • Titanium

They are all split between regions and conquerors. Allow you to upgrade your atlas and gain access to previously unavailable Path of Exile maps and bosses.

Some watchstones obtained from poe quests to upgrade the atlas and cannot be traded from other players for currency.