Prismarine Crystals are obtained by defeating sea lanterns or guardians, which inhabit ocean monuments. These luminescent items are essential for crafting sea lanterns, a light source, and can also be used in conjunction with prismarine shards to create dark prismarine, a decorative building block. Their acquisition encourages underwater exploration and combat, adding depth to aquatic adventures.
The numerical item ID for Prismarine Crystals is 410
Numerical item IDs will only work in Minecraft versions below 1.13.
The item ID for Prismarine Crystals is minecraft:prismarine_crystals
This is the spawn command to give yourself Prismarine Crystals in Minecraft which includes the Minecraft /give command. If you are using the Essentials plugin you will need to use /minecraft:give instead of /give