Hey, I’m Zathong and i will update Diablo 3 best Legendary Gem are: Bane of the Trapped, Bane of the Stricken, Zei’s Stone of Vengeance, Taeguk, Gem of Ease, Enforcer, Pain Enhancer, Gogok of Swiftness, Gem of Efficacious Toxin, Bane of the Powerful. Let’s just get into the details below!
Top 1: Bane of the Trapped

This is the most commonly used damage Legendary Gem, increasing your damage by 15% multiplicatively against enemies under the effect of control-impairing effects. You can level this Gem all the way up to rank 150.
Every upgrade will increase the damage gain by 0.3% up to a maximum of 60% total.
Control-impairing effects are: Fear, Stun, Freeze, Chill, Knockback, Immobilize and Slow including the Rank 25 effect of this Gem, making it proc itself in a 15 yard radius.
Top 2: Bane of the Stricken

Each attack you perform against an enemy increases the damage it takes from your attacks by 0.80%. You can level this Legendary Gem all the way up to rank 150. Every upgrade will increase the damage gain by 0.01% up to a maximum of 2.30% per stack.
The stacks are additive with themselves and multiplicative with all other damage bonuses. The secondary effect increases damage against Rift Guardians and Act Bosses by 25% multiplicatively.
Top 3: Zei’s Stone of Vengeance

Increases damage by 4% multiplicatively for every 10 yards between the player (pet damage is also based on the player-monster distance) and the enemy hit. Maximum 20% at 50 yards. You can level this Gem all the way up to rank 150. Every upgrade will increase the damage by another 0.08% per stack up to a maximum of 80% total.
The tooltip ismisleading as the first damage bonus is already active when you are right on top of the monster.
The secondary effect has a 20% chance to stun the enemy for 1 second when you hit them.
Top 4: Taeguk

Gain 2% additive damage for 1.5 seconds when you spend resources with a channeling skill. This effect stacks up to 10 times. You can level this Gem all the way up to rank 150. Every upgrade will increase the additive damage by another 0.04% per stack up to a maximum of 8% total.
Furthermore the rank 25 bonus increases your Armor by 2% for each stack. At max rank and stacks this Gem provides a whopping 80% additive damage increase as well as a 20% Armor buff.
Top 5: Gem of Ease

This is the only legendary Legendary Gem that is socketed into the Weapon slot! Every monster that is killed grants 500 additional experience points. You can level this Gem all the way up to rank 150. Every upgrade will increase the experience points gained by 50 up to a maximum of 8,000 total points per monster. This effect scales with Torment difficulty but not with Greater Rift levels.
If you want to find out more in-depth experience scaling mechanics about Experience per Kill and more check out this post. The rank 25 effect allows you to use this Gem and the weapon it is socketed into at any character level.
Top 6: Enforcer

All pets gain 15% multiplicative damage. You can level this Gem all the way up to rank 150. Every upgrade will increase the damage gain by another 0.3% up to a maximum of 60% total. With the secondary rank 25 effect reducing pet damage taken by 90% they become almost immortal.
Top 7: Pain Enhancer

Critical hits cause the enemy to bleed for 2,500% Physical damage over 3 seconds. You can level this Gem all the way up to rank 150.
Every upgrade will increase the Physical damage by another 50% weapon damage up to a maximum of 10,000% total.
Top 8: Gogok of Swiftness

Hitting an enemy gives you 1% Attack Speed and 0.5% Dodge Chance for 4 seconds, stacking up to 15 times. You can level this Gem all the way up to rank 150. Every upgrade will increase the Dodge Chance by another 0.01% weapon damage up to a maximum of 2% per stack total.
On top of that the rank 25 bonus increases your Cooldown Reduction by 1% per stack. On Rank 150 with 15 stacks active this Gem will give you at 15% Increased Attack Speed, 30% Dodge Chance and 15% Cooldown Reduction. Generally only skills with a proc coefficient can give you a Gogok of Swiftness stack, meaning that Pets and item procs will give you no stacks. However, this is not a hard rule and there are exceptions.
Top 9: Gem of Efficacious Toxin

This Gem applies a Poison Damage over Time effect for 2000% weapon damage over 10 seconds onto enemies when attacking them. You can level this Gem all the way up to rank 150. Every upgrade will increase the Poison damage by another 50% weapon damage up to a maximum of 9,500% total.
The rank 25 secondary bonus is the reason this Gem is played in every Support build in the game: All enemies you poison take 10% additive increased damage from all sources (including your party members) and also deal 10% less damage. Only the additive damage increase effects stacks with multiple Gem of Efficacious Toxin in the party!
Top 10: Bane of the Powerful
The player gains 20% multiplicative damage for 30 seconds after killing an Elite pack. In case of Rare (Yellow) Elites you also need to kill all the minions to receive this bonus. Rift Guardians, Act Bosses, Treasure Goblins and unique purple Monsters also give you the buff when slain.
You can level this Legendary Gem all the way up to rank 150. Every upgrade will increase the duration of the multiplicative damage buff by 1 second up to a maximum of 180 seconds. The secondary effect increases damage against Elites by 15%, which is additive to other Elite Damage sources like from The Furnace and multiplicative to base damage. Furthermore the secondary effect reduces damage taken from Elites by 15%. This bonus is multiplicative to other Elite damage reduction sources like Blackthorne’s Battlegear (3) Bonus.
Read more:
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