Sea Lantern

Sea Lanterns are underwater light sources that appear in ocean monuments.

Obtaining
When broken using anything other than a Silk Touch-enchanted tool, a sea lantern will drop 2–3 prismarine crystals. A Fortune enchantment increases the amount of prismarine crystals dropped. This method of obtaining sea lanterns is wasteful though; the 4 prismarine shards and up to 3 of the prismarine crystals used to craft it are non-retrievable.

Natural generation
Sea lanterns generate naturally in ocean monuments as their light source. They can be retrieved with any silk touch tool, dropping 2-3 prismarine crystals (up to 5 with fortune) if not.

Light source
Sea lanterns emit a light level of 15, the brightest possible light level in the game. They produce the same amount of light as glowstone, redstone lamps, Jack o'Lanterns, and beacons.

Trivia

 * The animation shows a very faint 'rippling' effect.

Gallery
Seelaterne Linterna del mar Lanterne aquatique Latarnia morska Морской фонарь 海晶灯