Crystallium

The mod introduces a group of crystal and gem items. Sapphire, Topaz and Ruby are new minerals that can be mined from ores already in the world, though each default ore has only a small chance to yield one of them. Obsidian Crystal and the Piece described by the author are crafting materials for higher-tier recipes, and a sparkling gem is used to make food that restores health.

Two combat items are included: Ruby Gauntlets, which grant regeneration to the wearer and apply the wither effect to enemies, and a fast Topaz Spear meant to keep enemies from escaping. The author notes that the mod is still in development and that the textures for only the first variant of each item have been changed so far.

Crystallium runs on client and server, so the server and every player need it. Builds exist for Fabric and Forge, for Minecraft 1.21 and 1.21.1, and the code is open source under the MIT License.