Grand Spectrum Cobalt Jewel PoE

PoE 3.19 added six new Grand Spectrum jewels. Grand Spectrum is the name shared by nine different unique jewels that each grant scaling bonuses based on the number of jewels called 'Grand Spectrum' placed into jewel sockets on the character's passive skill tree.

List of Grand Spectrum jewels

Image Name & Stats Trade Search
Grand Spectrum Grand Spectrum (Cobalt Jewel, minion crit multi)
  • Minions have +10% to Critical Strike Multiplier per Grand Spectrum
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Grand Spectrum Grand Spectrum (Cobalt Jewel, power charge)
  • +1 to Minimum Power Charges per Grand Spectrum
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Grand Spectrum Grand Spectrum (Cobalt Jewel, crit chance)
  • 25% increased Critical Strike Chance per Grand Spectrum
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Grand Spectrum Grand Spectrum (Crimson Jewel, resistance)
  • +7% to all Elemental Resistances per Grand Spectrum
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Grand Spectrum Grand Spectrum (Crimson Jewel, endurance charge)
  • +1 to Minimum Endurance Charges per Grand Spectrum
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Grand Spectrum Grand Spectrum (Crimson Jewel, life)
  • 5% increased Maximum Life per Grand Spectrum
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Grand Spectrum Grand Spectrum (Viridian Jewel, ailment avoidance)
  • 12% chance to Avoid Elemental Ailments per Grand Spectrum
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Grand Spectrum Grand Spectrum (Viridian Jewel, frenzy charge)
  • +1 to Minimum Frenzy Charges per Grand Spectrum
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Grand Spectrum Grand Spectrum (Viridian Jewel, elemental damage)
  • 15% increased Elemental Damage per Grand Spectrum
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Jewel limit: A character can't have more than three 'Grand Spectrum' jewels socketed. This limit is shared across all 'Grand Spectrum' jewels. For example, if a character has 3 Cobalt Grand Spectrum jewels socketed in their passive tree, they cannot use any Viridian or Crimson Grand Spectrum jewels.

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Grand Spectrum Mechanics

The total magnitude Mt of the bonuses granted by socketed Grand Spectrum jewels of type t is:

Mt = bt × nt × g

  • bt is the nominal magnitude of the bonuses granted by Grand Spectrum jewels of that type
  • nt is the number of socketed Grand Spectrum jewels of that type
  • g is the total number of socketed Grand Spectrum jewels

For example: if plaer has 1× Grand Spectrum(Cobalt Jewel, crit chance) and 2× Grand Spectrum (Viridian Jewel, elemental damage). This would result in:

  • 25 * 1 * 3 = +75% increased Critical Strike Chance
  • 15 * 2 * 3 = +90% increased Elemental Damage

Maximum Values

If you equip all three Grand Spectrum of any type, you can use the following table, simply select the number of Grand Spectrum of the given type you intend to equip, and add the results:

Item 1st 2nd 3rd
Grand Spectrum(Crimson Jewel, resistance) +21% to all Elemental Resistances +42% to all Elemental Resistances +63% to all Elemental Resistances
Grand Spectrum(Cobalt Jewel, crit chance) 75% increased Critical Strike Chance 150% increased Critical Strike Chance 225% increased Critical Strike Chance
Grand Spectrum(Viridian Jewel, elemental damage) 45% increased Elemental Damage 90% increased Elemental Damage 135% increased Elemental Damage
Grand Spectrum(Crimson Jewel, endurance charge) +3 to Minimum Endurance Charges +6 to Minimum Endurance Charges +9 to Minimum Endurance Charges
Grand Spectrum(Viridian Jewel, frenzy charge) +3 to Minimum Frenzy Charges +6 to Minimum Frenzy Charges +9 to Minimum Frenzy Charges
Grand Spectrum (Cobalt Jewel, power charge) +3 to Minimum Power Charges +6 to Minimum Power Charges +9 to Minimum Power Charges
Grand Spectrum (Viridian Jewel, ailment avoidance) 36% chance to Avoid Elemental Ailments 72% chance to Avoid Elemental Ailments 100% (108%) chance to Avoid Elemental Ailments
Grand Spectrum (Crimson Jewel, life) 15% increased Maximum Life 30% increased Maximum Life 45% increased Maximum Life
Grand Spectrum(Cobalt Jewel, minion crit multi) Minions have +30% to Critical Strike Multiplier Minions have +60% to Critical Strike Multiplier Minions have +90% to Critical Strike Multiplier

Grand Spectrum (Cobalt Jewel, minion crit multi)

Grand Spectrum Cobalt Jewel Grand Spectrum is a unique Cobalt Jewel.

  • Limited to: 3
  • Minions have +10% to Critical Strike Multiplier per Grand Spectrum

Flavour text: A mass of flesh writhing with savage fury.

Place into an allocated jewel socket on the passive skill tree. Right click to remove from the socket.

Grand Spectrum Cobalt Jewel PoE

Critical Strike Multiplier

A critical strike is a skill or default attack dealing increased damage and possibly inflicting elemental ailments. Whenever the player or a monster uses a skill, they have a chance to deal a critical strike by default.

Critical strikes are rolled on a per-action basis, not per-target. So each time a creature uses a skill, the critical strike roll is made once and only once. If someone rolls a critical strike, critical damage will be dealt to all targets hit by that skill.

Critical strikes deal more damage than normal, based on critical strike multiplier. All characters have a base critical strike multiplier of 150%. The damage will be multiplied according to

CriticalStrikeDamage = Damage * (BaseCriticalStrikeMultiplier + AdditionalCriticalStrikeMultiplier)

Where Damage is the base damage, BaseCriticalStrikeMultiplier = 150% and AdditionalCriticalStrikeMultiplier is the sum of all +#% to Critical Strike Multiplier.

This multiplier will be applied to all damage types of a hit. For instance, with +100% to Critical Strike Multiplier, if the player scores a critical strike with an attack that normally deals 100 physical damage and 10 cold damage, he will instead deal 250 physical damage and 25 cold damage.

Critical strike multipliers do not affect the critical strike multiplier on ailments, including global critical strike modifiers. Ailments have a base 150% multiplier when applied by a critical strike. The only way to increase the critical strike multiplier on ailments is with the Perfect Agony keystone.

Monsters have a base critical strike multiplier of 130%. It can be increased by various monster affixes and monster auras.

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