From WoW: IncGamers World of Warcraft Wiki

Patch 2.1.0 (2007-05-22)

• The jewelcrafting UI now has gems split up by color so it is easier to find gems of a specific color to create.
• A new set of more powerful gems can be found by raiding Hyjal and Black Temple. Their stats exceed those of previous gems that could be found.
• A number new gem cuts to existing gems have been added to the game. Included among them are a spell hit gem and more multi-stat gems that have attack power on them.
• Jewelcrafters can make two new melee oriented meta gems. One is found randomly as a world drop and the other sold by the reputation vendor.
• Thorium Setting only requires 1 thorium bar now.
• Many Jewelcrafting recipes that required 200-280 skill to learn now have changed/reduced materials required to make them
• Mithril filigree has a slightly reduced range that it gives skillups.
• A number of jewelcrafting gems now give skill increases for slightly longer than they used to.
• Pendant of Blasting and Necklace of Battle will now grant their click effects to players correctly, previously they only worked on characters higher than level 47.
• Jewelcrafting Onslaught ring thorium cost reduced
• The vendor value for the raw green gems have been reduced. This will also make these gems cheaper to put up on the auction house (Blood Garnet, Golden Draenite, etc...)
• Prospecting now always yields at least 1 gem.
• Grand Master Jewelcrafters Hamanar (Shattrath City), Jazdalaad (The Stormspire), Kalaen (Thrallmar) and Tatiana (Honor Hold) may teach all levels of Jewelcrafting.
• The recipe for Figurine - Golden Hare no longer requires a Cut Citrine. It now requires copper bars.
• Several new recipes that use Jaggal and Shadow Pearls have been added to jewelcrafting trainers.
• Increased the chance to find blue gems when prospecting.
• Removed the 1 hour cooldown when cutting diamonds.
• Reduced the matching requirements for some diamonds.