Diamond appears in the in-game database with a placeholder icon, but no Diamond nodes have been placed in the Early Access world yet. Most "where to find Diamond" searches actually want what Diamond did in Subnautica 1: enable cutting, advanced electronics, or deeper tools. Those roles in SN2 belong to other materials right now.
The Subnautica 2 item database lists Diamond as a Raw Material, but no spawn locations have been placed in the EA build. The icon you see in some wikis is a placeholder for a planned addition. If a future patch adds Diamond it will almost certainly live in the deeper Karakorum or in biomes that have not yet been opened (the "Open Ocean — unexplored" map edge).
This is not unusual for an Early Access game: the developers ship the database entry before they ship the world placement, so dataminers and the wiki pick it up immediately and search interest follows.
Three different crafting needs from Subnautica 1 sent players hunting for Diamond. In Subnautica 2 EA, here's where each need lives now:
If a patch places Diamond nodes in the world, this page will be updated within 24 hours with the confirmed biomes, depth ranges, and a marker added to the interactive map. Bookmark this page or check the trending searches board for the live update.
