Glass lantern lens and sapphire lens are removable from the finished lantern. This can be done by using a lens of one type on a lantern that has been finished with a lens of a different type, which will result in the two lens items swapping places. For example, you can use a glass lantern lens on a sapphire lantern to receive a regular bullseye lantern and a sapphire. An emerald lantern lens cannot be swapped out for a glass lantern lens. This does not require 49 crafting. After filling the lantern with lamp oil a player must use a tinderbox to light the lantern.