What do You think of such “cave platforms”? The view of the cave at the very bottom, the higher the platforms from red change color to yellow, green, and even higher they turn into a forest biome or ruins.
I added a 2nd type of large red gem that is “enchanted” in the stone, and in order to “disenchant/release” it, you have to visit the altar. Only after that, the gem is freed from the stone and you can pick it up normally...