Hazardous Research Cobalt JewelLimited to: 1 Radius: Medium(10-15)% increased Lightning Damage With at least 40 Intelligence in Radius, Spark fires Projectiles in a circleOf the elements at the thaumaturgist's disposal, lightning remained the least understood. The simple passage of energy from one to another could result in profound power, or rapid death.Place into an allocated Jewel Socket on the Passive Skill Tree. Right click to remove from the Socket.
Hazardous Research is a uniqueCobalt JewelCobalt JewelPlace into an allocated Jewel Socket on the Passive Skill Tree. Right click to remove from the Socket.. It is a threshold jewel that enhances SparkSparkSpell, Projectile, Duration, Lightning Level: (1-20) Cost: (5-21) Mana Cast Time: 0.65 sec Critical Strike Chance: 6.00% Effectiveness of Added Damage: 190% Projectile Speed: 420Launches unpredictable sparks that move randomly until they hit an enemy or expire.Deals (1-104) to (28-1983) Lightning Damage Base duration is 2.00 seconds Fires (4-8) Projectiles
Additional Effects From 1-20% Quality: Fires +(0.1-2) ProjectilesPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. and Vaal SparkVaal SparkSpell, Projectile, Duration, Vaal, Lightning Level: (1-20) Souls Per Use: 30 Can Store 1 Use(s) Soul Gain Prevention: 5 sec Cast Time: 0.65 sec Critical Strike Chance: 5.00% Effectiveness of Added Damage: 40%Continuously launches unpredictable sparks in all directions that move randomly until they hit an enemy or expire.Deals (1-24) to (11-454) Lightning Damage Base duration is 2.00 seconds Modifiers to Skill Effect Duration also apply to this Skill's Soul Gain Prevention Fires Projectiles in random directions
Additional Effects From 1-20% Quality: Fires +(0.1-2) ProjectilesCorruptedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket..
The Hazardous Research Unique Jewel no longer has "With at least 40 Intelligence in Radius, Spark fires 2 additional Projectiles" or "15-20% reduced Spark Duration". Existing items can be updated with a Divine Orb. The Jewel's purpose is now only to enable firing Spark projectiles in a circle if you want this behaviour.
Unique Threshold Jewels are no longer offered as a quest reward for completing "Death to Purity" in Act 5. Instead, you are now offered a choice of a Rare Crimson, Rare Cobalt, or Rare Viridian Jewel.
Cobalt JewelCobalt JewelPlace into an allocated Jewel Socket on the Passive Skill Tree. Right click to remove from the Socket.
. It is a threshold jewel that enhances 
SparkSparkSpell, Projectile, Duration, Lightning
and 
Vaal SparkVaal SparkSpell, Projectile, Duration, Vaal, Lightning
.
Compare each legacy variant to the current variant.