lyric arrow
Beautiful microsoft paint rendition attached.
Scuttlings are little bugs that look like gems, and camouflage as them in caves(possibly as a block). When hit (or mined, if the hiding state is a block), they pop out of their "shells" and either run away scared or maybe try to fight back (or mix of both, idk).
There would be one of every gem type, and their purpose is a renewable source of gem drops. Their spawns could be limited to specific y-levels or biomes/dimensions (hot biomes for ruby, onyx in end/deep dark, etc.).
Maybe they have special defenses depending on their gem type? Ruby ones light you on fire, sapphires freeze you, amethyst are thorny, you get the idea. :)
