SWTOR Red Lightsaber Crystals

Traditionally, in Old Republic lore, only Sith use red lightsaber crystals. Red color crystals were almost always synthetically created, as a way to quickly produce color crystals for Sith legions or as a way to avoid the Jedi protecting existing crystal sources. 

Notable Old Republic red lightsaber wielders include Darth Malgus, Darth Revan and Darth Malak.

A Jedi is not restricted to a single color. Rather, that color is a badge of pride for the Jedi Path it signifies. There are lots of options when it comes to red crystals in Star Wars: The Old Republic. The traditional red color crystal is called Advanced Red Color Crystal with variations in naming by the crystal's stats.

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  Black-Red StriatedCartel Market or GTN

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: No
  
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  Blood RedCartel Market or GTN

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: No
  
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  Fallen RedCartel Market or GTN

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: No
  
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  Gray-RedCartel Market or GTN

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: No
  
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  Hot OrangeCartel Market or GTN

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: No
  
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  Imperial CrimsonCartel Market or GTN

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: No
  
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  Orange-RedCartel Market or GTN

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: No
  
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  Pink-RedCartel Market or GTN

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: No
  
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  Red-BlackCartel Market or GTN

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: Yes
  
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  RedCrafting, Artifice Level 80

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: Yes*
  
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  Fire RedCrafting, Artifice Level 500

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: Yes
  
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  Furious Red-YellowNo longer available, earned from Ranked PvP seasons
  * Crystal does not include glow at hilt of lightsaber

  Artifact Authorization: Yes
  
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  Black-RedPvP, Mastery version requires Valor 10 and 150,000 Credits, other versions check GTN

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: Yes
  
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  Red-BlueCrafting, Artifice Level 600

  +41 Endurance
  +41 Power
  +41 Crit
  +41 Mastery
  Artifact Authorization: Yes