Blue Planet

The Blue Planet is a rare blue gemstone that can only be found in Greed Island. It is shaped like a sphere and the gem's surface seems to reflect light in a way that it produces an illusion of having an appearance of a moving atmospheric surface of a blue planet hence where it got it's name. Acquiring it was Biscuit_Krueger's main objective when she went to Greed Island which she acquired when she finished the game with Gon and Killua.