From Starbounder - Starbound Wiki
Removed: No Longer Available
Diamond Helmet was removed from the game files, and is no longer obtainable.
Diamond Helmet was part of the Diamond Set. Assets for this armor existed in the game files, but it was never craftable or obtainable through normal gameplay.
In update Cheerful Giraffe the helmet was removed, and the appearance was repurposed for the Valorous Helmet.
- Perturbed Koala: Added to game files
- Cheerful Giraffe: Removed (became Valorous Helmet)