World of Warcraft: The Art of Jewelcrafting

Blizzard's official World of Warcraft: The Burning Crusade website has been updated with a new page that provides specifics about how jewelcrafting will work in the expansion pack.
At higher levels, socketed items and specially cut gems become an important part of an adventurer's "bag of tricks". Both armor and weapons can have sockets. Some socketed items can be found in dungeons, but the expansion will also introduce a lot of new recipes for all the professions, including many recipes that let leatherworkers, blacksmiths, and tailors create socketed items. Socketed items can be of uncommon, rare, or even epic quality. An item's sockets can also have a specific color; if you put a gem of a matching color in each socket, the item will reward you with a special stat bonus beyond the gems' regular effects. However, you can also put gems of a different color in these slots if you would rather have a specific gem's effect instead of the added bonus.