Moonstone

The only source is Deepslate Moonstone Ore, below Y −8, mined with an iron pickaxe or better. No villager sells moonstone and no mob drops it.

For the Pearl colorway put a dyeable cosmetic and 1 Moonstone into a crafting grid. The item gets white, lavender, light blue and light pink stripes whose colors flow into each other in an 8-second cycle, and loses the dye and colorway it had. The same 32 items take it as take glitter and neon: all dyeable cosmetics except backpacks and pet outfits.