Broken plate

A few days after the 2005 April Fools' Day event, if you spun a spinning plate, you may drop it, and it would break into this. Due to player complaints, Jagex removed the broken plate, and plates now cannot be broken.

However, Jagex never removed the already broken plates from the game, though they are un-tradeable, they are discontinued. It is unknown how many of these plates are left in RuneScape. Being as they cannot be traded, a price cannot be put on them, thus leaving their rarity in question. Some believe they are rarer than a party hat, being as they cannot be traded, and therefore were dropped by many. This is total speculation however.