Only 8 types of unique jewels are in-game, and they all have a common name, the Rainbow Facet. Like other items, jewels can be Magic, Rare (Rare Jewels can have up to four magical properties, as opposed to the usual six) and even Unique. Because of this, they are a popular option for extreme item customizers, as they can bestow attributes to items that would otherwise be impossible to generate by the game engine. Unlike other socketable items, jewels do not change their attributes when socketed in different items. Before inserting a Jewel, its magical properties must be 'identified' either by the use of a Scroll/ Tome of Identify, or by Deckard Cain, who can provide such a service. Jewels are similar to Gems and Runes, except that instead of having predetermined magical abilities like a Gem or Rune, each Jewel possesses random magic properties, bestowing a wide variety of magical abilities to Socketed Items. A Jewel spawns with 1-4 random magical attributes which only have effects after it is socketed. A Jewel is a type of socketable item in Diablo II that can be put in an item with sockets.