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Legendary Gems are gems introduced in the patch 2.1 of Diablo III, that are only socketable in amulets and rings (except the Gem of Ease, which can only be socketed into a weapon, and Helm-only Red Soul Shard). Most of these gems can only drop from Rift Guardians in Greater Rifts, though one can be found as a drop from Greed in the Treasure Realm. In addition to the gems being unique equipped and account bound, any one character can not even receive any gem that they already have in their possession, including the shared stash. The gems are dropped at Rank 0 and can be upgraded by speaking with Urshi. Legendary gems do not work when equipped on a follower.
The Legendary Gems are not account-unique, but a character will never get a gem that they already have in inventory, equipped on follower, equipped on themselves, or in the shared stash, or socketed into any item in any of the listed places.
The gems will only drop at character level 70, but can be used at any level by other characters on the same account.
There are currently 21 Legendary Gems (Patch 2.4.0).
As of patch 2.4, Legendary Gems also show their Rank in inventory or any interface panel tied to them.
- Bane of the Powerful:
- Bane of the Stricken:
- Bane of the Trapped:
- Boon of the Hoarder:
- Boyarsky's Chip:
- Increase the damage of your pets by 15%. Upgrading increases pet damage by 0.3%.
- Rank 25 bonus: Your pets take 90% reduced damage.
- Esoteric Alteration:
- Gem of Ease:
- Gem of Efficacious Toxin:
- Poison all enemies hit for 2000% damage as Poison over 10 seconds. Upgrading increases damage by 50%.
- Rank 25 bonus: All enemies you poison take 10% increased damage from all sources and deal 10% less damage with all attacks.
- Gogok of Swiftness:
- All Cold skills always Chill enemies, slowing them by 60% for 1 second (unless already better), and slowdown potency of all Chill effects increases by 5% (up to 80%). Upgrading increases speed reduction by 0.4%.
- Rank 25 bonus: gain additional 10% Critical Hit Chance against Chilled or Frozen enemies.
- Invigorating Gemstone:
- Mirinae, Teardrop of the Starweaver:
- Molten Wildebeest's Gizzard:
- 35% of all damage taken is instead staggered and dealt to you over 3.0 seconds. Upgrading increases duration by 0.1 seconds.
- Rank 25 bonus: 20% chance on kill to clear all staggered damage.
- Mutilation Guard:
- Pain Enhancer:
- Red Soul Shard (Anniversary Dungeon only)
- Periodically struggle for control, unleashing a ring of fire that deals 12500% damage as Fire to enemies it passes through. Upgrading increases damage by X%.
- Rank 25 bonus: After gaining a Character Level or Paragon Level, the character has their resource costs and cooldowns of all skills reduced by 75% for 30 seconds.
- Simplicity's Strength:
- Increases the damage of Primary skills by 25%. Upgrading increases damage bonus by 0.5%.
- Rank 25 bonus: Primary skills heal you for 4% of maximum Life if they hit an enemy.
- Gain 2.00% increased damage for 1.5 seconds for each tick of a channeled skill. This effect stacks up to 10 times. Gaining a stack refreshes all existing stacks. Upgrading increases damage bonus by 0.04% per stack.
- Rank 25 bonus: Gain 2% increased armor for every stack.
- Wreath of Lightning:
- Zei's Stone of Vengeance:
- Damage enemies suffer increases by 4% for every 10 yards between you and the enemy hit (max 20% at 50 yards). Upgrading increases damage bonus by 0.08% (also increasing the maximum bonus by 0.4%).
- Rank 25 bonus: 20% chance on hit to Stun the enemy for 1 second.
- Shen's Delight:
These gems can be upgraded by speaking with Urshi, who will appear on every level of a Greater Rift after the Rift Guardian has been defeated in time. It does not cost anything to upgrade the gem. The blue property on the gem is the only property that will be upgraded. The upgrade success rate will increase as the Greater Rift level increases, but it also decreases with the rank of the gem, i.e. one will need higher Tier to even have a chance to upgrade the high-level gems.
The maximum number of attempts Urshi can offer per run is three (+1 if the Rift is empowered), and each is either successful (+1 rank), or failed (nothing happens). As of patch 2.4.3, finishing a Rift without dying will also grant +1 extra attempt, to a maximum of 5 (Hardcore characters will always get an extra attempt).
A gem's chance to upgrade will be guaranteed if the difficulty level of the rift is at least 10 greater than the rank of the gem. When the differences between the rift and gem reach below 10, the chance of successful upgrading decreases, first to 90% (9 ranks above), then 80% (8 ranks above), 70% (7 ranks above) and 60% (0-6 ranks above). If a gem's level is higher than that of the Greater Rift's difficulty level, then the chances of a successful upgrading are cut in half for every rank (30%, 15%, 7.5%, 3.75%, etc), and become 0% when the difference reaches 7 ranks.
In other words, to even get a chance to get the rank 25 bonus, the player must be able to clear a rank 18 rift. To get good chances (higher than 30%), the player must be able to clear a rank 24 rift, i.e. be geared well enough to efficiently farm on Torment VI. To have a 100% chance to gain the level that grants the secondary bonus of the gem, they need to clear a level 34 rift or above.
When the gem reaches rank 25, it will gain a secondary power, which is not empowered by further rank increases.
Note that while most gems have no cap (and therefore can be upgraded endlessly, should their owner be good enough to clear a rift of high enough rank), some have an effective cap (usually around rank 125-150 or so), and while technically they can still be upgraded afterwards, this will give no extra benefit. However, most of these gems have a cap that is not obtainable by normal means.