It boosts defense by 8 and life regeneration by 2, even while the player is under the effects of a damaging debuff. When worn while being damaged by a debuff, the player's defense will increase by an additional 11 (for a total of 19) and life regen will increase by an additional 2 (for a total of 4). Pressing the Astral Teleport key while no bosses are alive will teleport the player to a random location in the same manner as a Teleportation Potion, and has no cooldown.
- If the player is under the effect of one of the alcohols sold by the Drunk Princess, the accessory's life regen bonuses will be reduced to 1 regardless of other debuffs.
- Pairing this item with the Spelunker's Amulet or Spelunker Potions can help the player find rare ores.
- This accessory can be considered a successor to the Crown Jewel, due to their shared unique debuff regen and defense function. However, Crown Jewel can only be obtained using Malice Mode, whereas Celestial Jewel is available in all modes.
- In previous updates, Celestial Jewel was a direct upgrade to the Crown Jewel, and both were exclusive to Revengeance Mode.