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They can be upgraded repeatedly and will only fit into sockets in rings and amulets. Legendary Gems were added to the game in Patch 2.1.
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Gems can be upgraded in rank by the Jeweler for a fee of gold and materials. At least one and often several gems drop from special targets, such as Resplendent chests, Treasure Goblins, Horadric Caches, etc. Gems drop randomly from every sort of target monsters, Elites, chests, barrels, etc. The bonuses provided by gems increase with the rank of the gem and become quite substantial at the highest ranks. There are five types of gems in Diablo III Amethysts, Diamonds (added in D3v2), Emeralds, Rubies and Topazes. Gems are small objects that grant bonuses when socketed into items.
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