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Legendary Gems (or LGems or LeGems) were added to [[Reaper of Souls]] in [[Patch 2.1]], after extensive testing on the [[PTR]]. There were initially 14 types of Legendary Gems, with 3 more added in each [[Season Two]]. Most Legendary Gems have a function only when socketed in rings and amulets, and they are very powerful items, so that a socket in all 3 jewelry items is considered mandatory for [[end game]] gear. (The [[Gem of Ease]] is the only exception, and it can only be socketed into a weapon.) LGems drop only from Greater Rift Guardians, and thus can only be obtained by level 70 characters, (the one exception is the [[Boon of the Hoarder]]) though LGems have no level req and can be used by any level character, and they make very powerful [[twinks]]. To upgrade LGems, players must interact with [[Urshi]], a ghostly NPC who appears after the death of the Greater Rift Guardian.  The value of the bonus increases with each rank the gem is upgraded, with a special special secondary power unlocked at rank 25. These rank 25 powers vary widely in quality, from "this makes the gem worth using" to "irrelevant for some builds." There is no theoretical upper limit to the gem's rank, rings and all gems improve with every rank. However, the odds are very poor to raise a LGem's level higher than the maximum Grift a player can clear, so for most players their LGems have a practical limit of several levels higher than their highest Greater Rift, and largest possible difference is 7 ranks. When 6 ranks higher than the Grift, there is a 1% chance the LGem will upgrade. * '''Diablo 2 Jewels''': While the developers call these items "legendary gems" these socketables have nothing in common amulets with regular [[gems]] in stats or appearance, and are more analogous to the {{iw|Unique_Jewels Rainbow Facet unique jewels}} of Diablo 2sockets highly sought.

Legendary Gems: * Are All gems are dropped only at rank 0 and only by [[Greater Rift Guardians]], the final boss found in must be socketed into a [[Greater Rift]]. ** One exception: [[Boon of the Hoarder]] drops only from [[Greed]], the boss in [[The Vault]] treasure level.*** After a players has found one Boon of the Hoarder from Greed, that gem is eligible to drop from Greater Rift Guardians.* At least one Legendary Gem should drop from each GR Guardian, until a character + stash has all the gems. Duplicate gems are never dropped.** To find more than one of the same gem, you need to put the first gem on another character ring or drop it in town before starting the Greater Rift.** This is actually a benefit to players seeking a specific gemamulet, since holding the other types means you won't find any duplicates.* LGems can only be socketed into making such rings and amulets - not any other item types.** [[Gem of Ease]] added in [[Season Two]] is the only exception; it sockets into weapons.* LGems only work when equipped by players. They do not function when equipped on [[followers]]. (Including Gem of Easevaluable.)* LGems Players can only be upgraded with [[Urshi]], use the NPC who appears only in [[Greater RiftsMystic]] after the Guardian is defeatedto add sockets to ring and amulets they like.** Upgrade odds are entirely based on the level of the Greater Rift Socketing and removing work the level of the gem. ** If the level of the Grift is more than 10 higher than the rank of the gem, the odds are 100% for an upgrade. If the Grift is more than 7 levels lower than the gem, the odds are 0%. Full odds listed belowsame as with normal Gems.