Item Rarity is an in-game classification system used to indicate the rarity of each individual item or model. Rarity is determined by the chance of a given player obtaining that item, model or brick. Item Rarity is displayed in a system of diamonds, one diamond being common, two diamonds uncommon, three diamonds rare, and four diamonds very rare. However, it is not good to take this system as accurate, as some rares are more rare than others, and this system doesn't show it in enough detail, as some 4 star rares can only be obtained by battling or by contest reward, they are rarer than achievement 4 star rares. Players often disregard this method and use experience as a basis for the rarity and price of items, especially while trading.