Similar thing was done on Diablofans originally, but now that the gem upgrade levels have changed (again, on the most recent PTR) it would be helpful to do it again. In any case, reply to this post with findings on these values and I'll update this post.
Bane of the Powerful
- Gain 30%25%20% increased damage for 20 seconds after killing an elite pack.
- Upgrade rank grants: +10.5 ? second buff duration.
- Rank 25 unlocks: Gain 20%15% bonus damage to elites.
Bane of the Trapped
- Increase damage against enemies under control-impairing effects by 20% 15%.
- Upgrade rank grants: +0.5%0.1% 0.3% damage.
- Rank 25 unlocks: Gain an aura that reduces the movement speed of enemies within 15 yards by 30%.
Boon of the Hoarder
- 30% chance on killing an enemy to cause an explosion of gold.
- Upgrade rank grants: +1%? chance on kill.
- Rank 25 unlocks: Gain 30% increased movement speed for 3 seconds after picking up gold.
Enforcer
- Increase the Critical Hit Chancedamage of your pets by 25% 15%.
- Upgrade rank grants: +0.4% Critical Hit Chance. Max +20% upgrade (+40% total).0.5% 0.3% damage
- Rank 25 unlocks: Your pets are unkillabletake 30%25% less damage.
Gem of Efficacious Toxin
- Poison all enemies hit for 1000%2000% weapon damage over 10 seconds.
- Upgrade rank grants: +20%5% 50% weapon damage over 10 seconds.
- Rank 25 unlocks: All enemies you poison take 10% increased damage from all sources.
Gogok of Swiftness
- 50%40%50% chance on hit to gain Swiftness, increasing your Attack Speed by 2%3% 1% for 343seconds. This effect stacks up to 10 15 times.
- Upgrade rank grants: +1%0.3%1% chance.
- Rank 25 unlocks: Gain 2% 1% Cooldown Reduction per stack of Swiftness.
Invigorating Gemstone
- While under any control-impairing effects, reduce all damage taken by 30%.
- Upgrade rank grants: +1%?. Maximum +50% upgrade (80% total).
- Rank 25 unlocks: Heal for 20% of maximum life when hit by control-impairing effect.
Mirinae, Teardrop of the Starweaver
- 15% chance on hit to smite a nearby enemy for 1000%2000% weapon damage as Holy.
- Upgrade rank grants: +20%5% 40% weapon damage.
- Rank 25 unlocks: Smite a nearby enemy every 5 seconds.
Moratorium
- 30% 25% of all damage taken is instead staggered and dealt to you over 3 seconds.
- Upgrade rank grants: +0.1? second to the stagger duration.
- Rank 25 unlocks: 10% chance on kill to clear all staggered damage.
Pain Enhancer
- Critical hits cause the enemy to bleed for 500%1200% weapon damage as Physical over 3 seconds.
- Upgrade rank grants: +10%2.5 ? weapon damage over 3 seconds.
- Rank 25 unlocks: Gain Blood Frenzy, granting you 2%3% increased Attack Speed for each bleeding enemy within 20 yards.
Simplicity’s Strength
- Increase the damage of primary skills by 25%30.0% 25%.
- Upgrade rank grants: +0.5%0.1% 0.5% damage.
- Rank 25 unlocks: Primary skills heal you for 2% of maximum health on hit.
Taeguk
- Gain 1%0.5% increased damage for 4 seconds after spending primary resource. This effect stacks up to 10 times. Gaining a stack refreshes all existing stacks.
- Upgrade rank grants: +1 max stack.
- Rank 25 unlocks: Gain 1%0.5% increased Armor for every stack.
Wreath of Lightning
- 15% chance on hit to gain a Wreath of Lightning, dealing 500%600% weapon damage as Lightning every second to 1-2 nearby enemies for 3 seconds.
- Upgrade rank grants: +10%2% 10% weapon damage per second.
- Rank 25 unlocks: While under the effect of the Wreath of Lightning, gain 25% increased movement speed.
Zei’s Stone of Vengeance
- Damage you deal is increased by 6% 4% for every 10 yards between you and the enemy hit. Maximum30% 20% increase.
- Upgrade rank grants: +0.1% ? for every 10 yards (+0.5% to max).
- Rank 25 unlocks: 30% 20% chance on hit to Stun the enemy for 1 second.