Legendary Gems Sneak Peak

An early look at Legendary gems in Diablo III patch 2.1

Diablo III Patch 2.1 PTR - Legendary Gem
A new feature coming in Diablo III Patch 2.1.0 is Legendary gems. They are made for sockets in rings and amulets, and will provide special powers not available from standard gems. While Legendary jewels currently aren't fully active on the patch 2.1 PTR, enough details have slipped through to allow an early look at how they may play out.

It's important to keep in mind that this is all still early and unofficial data, as the Legendary gems have not been fully activated yet on the Public Test Realm. A blue post makes that clear:
We're still developing and designing Legendary Gems, so they have not yet been implemented. They're just not ready for testing on the 2.1.0 PTR right now. Once we've fleshed out Legendary Gems a bit more, we'll patch them in with a later PTR build. Each PTR patch will be accompanied by patch notes (published in the PTR launcher and the front page of this site), so just keep an eye on those notes to see when Legendary Gems become available. :)

Legendary Gems are still undergoing significant iteration at this time, so you won't see them available on the PTR right away. The gist is that these gems are infinitely upgradeable, and provide special Legendary powers when socketed into the appropriate gear slot. They can only be socketed into Rings and Amulets, and can be upgraded by completing additional Greater Rifts. The higher you place in a Greater Rift, the more likely your gem will be successfully upgraded. We'll have more details in the future as we continue development on these powerful baubles, so stay tuned!

Source: http://us.battle.net/d3/en/blog/14244559/patch-210-ptr-preview-6-17-2014#greaterrifts

There are a few parts of the Legendary gem system that have already showed up. The first is that one of the gems did drop, as seen in the image above. The obviously placeholder name will be changed in the future, but the Legendary gem stats are interesting. The fixed stat is Gain 30% increased damage for 20 seconds after killing an elite pack. The other stat appears to be upgradeable, and starts at Increases damage against elites by 20%. This ties into the idea that the gems will be upgradeable by going through higher difficulty Greater Rifts; this one appears to require a Rank 50 Greater Rift before it can be upgraded further.

A reddit thread has a list of the possible Legendary gem stats, taken from datamining the PTR Diablo III data. It is listed in three parts: the placeholder Legendary gem name; the fixed stat, and the upgradeable stat. The internal calculated numbers are shown in these item stats, but it is easy to get a feel for the type of Legendary powers that the developers are looking to add with the Legendary gems.

Datamined Possible Legendary Gem Stats
Gem of Damage After Elite Pack
  • Fixed Stat: Gain 30% increased damage for 20 seconds after killing an elite pack.
  • Upgradeable Stat: Increases damage against elites by 20%.
Gem of Increased Damage Against CCed Enemies
  • Fixed Stat: Increase damage against enemies under the effects of control-impairing effects by [{VALUE1}*100|1|]%.
  • Upgradeable Stat: Gain an aura that reduces the movement speed of enemies within 12 yards by [{VALUE1}*100]%.
Gem of Reduced Level Requirement
  • Could not find corresponding strings, but probably pretty self explanatory.
Gem of Mini-Conduit
  • Fixed Stat: 15% chance on hit to gain a mini-Conduit buff, dealing [{VALUE1}*100]% weapon damage as Lightning every second to nearby enemies for 3 seconds.
  • Upgradeable Stat: While under the effect of the mini-Conduit, gain [{VALUE1}*100] increased movement speed.
Gem of Poison DoT Debuff
  • Fixed Stat: Poison all enemies hit for [{VALUE1}*100]% weapon damage over 10 seconds.
  • Upgradeable Stat: All enemies you poison take [{VALUE1}*100]% increased damage from all sources.
Gem of Deep Wounds
  • Fixed Stat: Critical hits cause the enemy to bleed for [{VALUE1}*100]% weapon damage as Physical over 3 seconds.
  • Upgradeable Stat: Gain Blood Frenzy, granting you [{VALUE1}*100]% increased Attack Speed for each bleeding enemy within 20 yards.
Gem of Holy Smite
  • Fixed Stat: 15% chance on hit to smite a nearby enemy for [{VALUE1}*100]% weapon damage as Holy.
  • Upgradeable Stat: Periodically smite a nearby enemy.
Gem of Increased Attack Speed
  • Fixed Stat: [{VALUE1}*100|1|]% chance on hit to increase your Attack Speed by 2% for 3 seconds, stacking up to 10 times.
  • Upgradeable Stat: Also Gain [{VALUE1}*100]% Cooldown Reduction per stack.
Gem of Damage Reduction while CCed
  • Fixed Stat: While under any control-impairing effects, reduce all damage taken by [{VALUE1}*100]%.
  • Upgradeable Stat: Heal for [{VALUE1}*100]% of maximum life when hit by control-impairing effect.
Gem of Pet Crit Chance
  • Fixed Stat: Increase the Critical Hit Chance of your pets by [{VALUE1}*100]%.
  • Upgradeable Stat: Your pets are unkillable.
Gem of Stagger Damage
  • Fixed Stat: 50% of all damage taken is instead staggered and dealt to you over [{VALUE1}|1|] seconds.
  • Upgradeable Stat: [{VALUE1}*100]% chance on kill to clear all staggered damage.
Gem of Steady Aim
  • Fixed Stat: Damage you deal is increased by [{VALUE1}*100|1|]% for every 10 yards between you and the enemy hit.
  • Upgradeable Stat: [{VALUE1}*100]% chance on hit to Stun the enemy for 1 second.
Gem of Primary Skill Hit Harder
  • Fixed Stat: Increase the damage of primary skills by [{VALUE1}*100]%.
  • Upgradeable Stat: Primary skills heal you for 2% of maximum health on hit.
Gem of Goldsplosion
  • Fixed Stat: [{VALUE1}*100]% chance on killing an enemy to cause an explosion of gold.
  • Upgradeable Stat: Gain [{VALUE1}*100]% increased movement speed for 3 seconds after picking up gold.
Gem of Increased Damage after Spending Resource
  • Fixed Stat: Gain 1% increased damage for 3 seconds after spending primary resource. This effect stacks up to {VALUE1} times. Gaining a stack refreshes all existing stacks.
  • Upgradeable Stat: Gain 1% increased Armor for every stack.

So how will those Legendary gems be upgraded? We also have an early look at the new Artisan for that. There seems to be a small chance that Urshi will appear at the end of a Greater Rift run (after the Greater Rift boss has been killed, but if the timer was not reached). It appears that he will be able to upgrade those Legendary gems, although it is not known what that will cost, or how far the upgrades can go.

Urshi - Artisan for Legendary Gems
So there we have a sneak peak at what may be the upcoming system for Legendary gems in patch 2.1.0. They will be fully implemented on the PTR in the coming weeks, and we'll be able to fully test out this new addition to the game!
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