Every RPG has, to some degree, a method of equipping the members of your party. In some games you give them weapons and armour; in others you can customize armaments with additional effects; in yet others equipment is ignored entirely in favour of enhancing items. Child of Light falls into this final category, relying entirely on oculi to bolster a character's stats.
Appearing as gleaming crystals that can be both found in the field and crafted in the Oculi menu, oculi are fairly versatile. Each bestows one of three distinct effects, depending on where they're equipped on a person's body, and they can be combined to form stronger oculi, to a maximum of four tiers of power. Oculi can make all the difference in a heated battle, and thus it's a wise idea to experiment with them to see which oculi work with which characters.
Below is a list of the oculi of Child of Light, separated by tier. Every oculus on the list can be created with the three base oculi listed immediately below, though be warned - you'll have to do a lot of crafting to reach the highest tier.
First Tier
Rough Sapphire
  • Crafting Requirements: Found
  • Equipped on Weapon: Adds water damage
  • Equipped on Body: +8% water resistance
  • Equipped as Accessory: Evasion +5% while Casting

Rough Ruby
  • Crafting Requirements: Found
  • Equipped on Weapon: Adds fire damage
  • Equipped on Body: +8% fire resistance
  • Equipped as Accessory: +4 HP

Rough Emerald
  • Crafting Requirements: Found
  • Equipped on Weapon: Adds lightning damage
  • Equipped on Body: +8% earth resistance
  • Equipped as Accessory: +2 HP

Rough Tourmaline
  • Crafting Requirements: 1 Rough Sapphire, 1 Rough Emerald
  • Equipped on Weapon: 5% chance of inflicting paralysis
  • Equipped on Body: Reduce magical damage by 5%
  • Equipped as Accessory: Magic +2

Rough Amethyst
  • Crafting Requirements: 1 Rough Sapphire, 1 Rough Ruby
  • Equipped on Weapon: +20% physical damage when HP below 20%
  • Equipped on Body: Reduce physical damage by 5%
  • Equipped as Accessory: +20% magical damage when HP below 20%

Rough Citrine
  • Crafting Requirements: 1 Rough Ruby, 1 Rough Emerald
  • Equipped on Weapon: Adds light damage
  • Equipped on Body: +5% to dodge when defending for one turn
  • Equipped as Accessory: +5% to bump target dark creature on Timeline

Rough Diamond
  • Crafting Requirements: 1 Rough Sapphire, 1 Rough Ruby, 1 Rough Emerald
  • Equipped on Weapon: Speed +1
  • Equipped on Body: Experience +5%
  • Equipped as Accessory: Casting Speed +3%

Rough Onyx
  • Crafting Requirements: 1 Rough Tourmaline, 1 Rough Amethyst, 1 Rough Citrine
  • Equipped on Weapon: Magical attack +10%
  • Equipped on Body: -20% damage sustained when HP below 20%
  • Equipped as Accessory: +20% to dodge while Casting when HP below 20%

Rough Spinel
  • Crafting Requirements: 1 Rough Diamond, 1 Rough Onyx
  • Equipped on Weapon: Physical attack +15%
  • Equipped on Body: +10% speed for one turn when interrupted
  • Equipped as Accessory: Begin each turn 5% forward on Timeline
Second Tier
Tumbled Sapphire
  • Crafting Requirements: 3 Rough Sapphires
  • Equipped on Weapon: +8% water damage
  • Equipped on Body: +14% water resistance
  • Equipped as Accessory: Evasion +10% while Casting

Tumbled Ruby
  • Crafting Requirements: 3 Rough Rubies
  • Equipped on Weapon: +8% fire damage
  • Equipped on Body: +14% fire resistance
  • Equipped as Accessory: +8 HP

Tumbled Emerald
  • Crafting Requirements: 3 Rough Emeralds
  • Equipped on Weapon: +8% lightning damage
  • Equipped on Body: +14% earth resistance
  • Equipped as Accessory: +4 MP

Tumbled Tourmaline
  • Crafting Requirements: 1 Tumbled Sapphire, 1 Tumbled Emerald OR 3 Rough Tourmalines
  • Equipped on Weapon: 10% chance of inflicting paralysis
  • Equipped on Body: Reduce magical damage by 10%
  • Equipped as Accessory: Magic +4

Tumbled Amethyst
  • Crafting Requirements: 1 Tumbled Sapphire, 1 Tumbled Ruby OR 3 Rough Amethysts
  • Equipped on Weapon: +30% physical damage when HP below 20%
  • Equipped on Body: Reduce physical damage by 10%
  • Equipped as Accessory: +30% magical damage when HP below 20%

Tumbled Citrine
  • Crafting Requirements: 1 Tumbled Ruby, 1 Tumbled Emerald OR 3 Rough Citrines
  • Equipped on Weapon: Adds 10% light damage
  • Equipped on Body: +10% to dodge when defending
  • Equipped as Accessory: +10% to bump target dark creature on Timeline

Tumbled Diamond
  • Crafting Requirements: 1 Tumbled Sapphire, 1 Tumbled Ruby, 1 Tumbled Emerald OR 3 Rough Diamonds
  • Equipped on Weapon: +2 Speed
  • Equipped on Body: +10% XP
  • Equipped as Accessory: Casting Speed +6%

Tumbled Onyx
  • Crafting Requirements: 1 Tumbled Tourmaline, 1 Tumbled Amethyst, 1 Tumbled Citrine OR 3 Rough Onyxes
  • Equipped on Weapon: Magical attack +15%
  • Equipped on Body: -30% damage sustained when HP below 20%
  • Equipped as Accessory: +30% to dodge while Casting when HP below 20%

Tumbled Spinel
  • Crafting Requirements: 1 Rough Diamond, 1 Rough Onyx OR 2 Rough Spinels
  • Equipped on Weapon: Physical attack +20%
  • Equipped on Body: +20% speed for one turn when interrupted
  • Equipped as Accessory: Begin each turn 10% forward on Timeline

Third Tier
Faceted Sapphire
  • Crafting Requirements: 3 Tumbled Sapphires
  • Equipped on Weapon: +12% water damage
  • Equipped on Body: +18% water resistance
  • Equipped as Accessory: Evasion +15% while Casting

Faceted Ruby
  • Crafting Requirements: 3 Tumbled Rubies
  • Equipped on Weapon: +12% fire damage
  • Equipped on Body: +18% fire resistance
  • Equipped as Accessory: +12 HP

Faceted Emerald
  • Crafting Requirements: 3 Tumbled Emeralds
  • Equipped on Weapon: +12% lightning damage
  • Equipped on Body: +18% earth resistance
  • Equipped as Accessory: +6 MP

Faceted Tourmaline
  • Crafting Requirements: 1 Faceted Sapphire, 1 Faceted Emerald OR 3 Tumbled Tourmalines
  • Equipped on Weapon: 15% chance of inflicting paralysis
  • Equipped on Body: Reduce magical damage by 15%
  • Equipped as Accessory: Magic +6

Faceted Amethyst
  • Crafting Requirements: 1 Faceted Sapphire, 1 Faceted Ruby OR 3 Tumbled Amethysts
  • Equipped on Weapon: +20% physical damage when HP below 30%
  • Equipped on Body: Reduce physical damage by 15%
  • Equipped as Accessory: +20% magical damage when HP below 30%

Faceted Citrine
  • Crafting Requirements: 1 Faceted Ruby, 1 Faceted Emerald OR 3 Tumbled Citrines
  • Equipped on Weapon: Adds 15% light damage
  • Equipped on Body: +15% to dodge when defending
  • Equipped as Accessory: +15% to bump target dark creature on Timeline

Faceted Diamond
  • Crafting Requirements: 1 Faceted Sapphire, 1 Faceted Ruby, 1 Faceted Emerald OR 3 Tumbled Diamonds
  • Equipped on Weapon: +4 Speed
  • Equipped on Body: +15% XP
  • Equipped as Accessory: Casting Speed +9%

Faceted Onyx
  • Crafting Requirements: 1 Faceted Tourmaline, 1 Faceted Amethyst, 1 Faceted Citrine OR 3 Tumbled Onyxes
  • Equipped on Weapon: Magical attack +20%
  • Equipped on Body: -20% damage sustained when HP below 30%
  • Equipped as Accessory: +20% to dodge while Casting when HP below 30%

Faceted Spinel
  • Crafting Requirements: 1 Faceted Diamond, 1 Faceted Onyx OR 2 Tumbled Spinels
  • Equipped on Weapon: Physical attack +25%
  • Equipped on Body: +30% speed for one turn when interrupted
  • Equipped as Accessory: Begin each turn 20% forward on Timeline

Fourth Tier
Brilliant Sapphire
  • Crafting Requirements: 3 Faceted Sapphires
  • Equipped on Weapon: +16% water damage
  • Equipped on Body: +24% water resistance
  • Equipped as Accessory: Evasion +10% while Casting

Brilliant Ruby
  • Crafting Requirements: 3 Faceted Rubies
  • Equipped on Weapon: +16% fire damage
  • Equipped on Body: +24% fire resistance
  • Equipped as Accessory: +8 HP

Brilliant Emerald
  • Crafting Requirements: 3 Faceted Emeralds
  • Equipped on Weapon: +16% lightning damage
  • Equipped on Body: +24% earth resistance
  • Equipped as Accessory: +4 MP

Brilliant Tourmaline
  • Crafting Requirements: 1 Brilliant Sapphire, 1 Brilliant Emerald OR 3 Faceted Tourmalines
  • Equipped on Weapon: 20% chance of inflicting paralysis
  • Equipped on Body: Reduce magical damage by 20%
  • Equipped as Accessory: Magic +8

Brilliant Amethyst
  • Crafting Requirements: 1 Brilliant Sapphire, 1 Brilliant Ruby OR 3 Faceted Amethysts
  • Equipped on Weapon: +30% physical damage when HP below 30%
  • Equipped on Body: Reduce physical damage by 20%
  • Equipped as Accessory: +30% magical damage when HP below 30%

Brilliant Citrine
  • Crafting Requirements: 1 Brilliant Ruby, 1 Brilliant Emerald OR 3 Faceted Citrines
  • Equipped on Weapon: Adds 20% light damage
  • Equipped on Body: +20% to dodge when defending
  • Equipped as Accessory: +20% to bump target dark creature on Timeline

Brilliant Diamond
  • Crafting Requirements: 1 Brilliant Sapphire, 1 Brilliant Ruby, 1 Brilliant Emerald OR 3 Faceted Diamonds
  • Equipped on Weapon: +6 Speed
  • Equipped on Body: +20% XP
  • Equipped as Accessory: Casting Speed +12%

Brilliant Onyx
  • Crafting Requirements: 1 Brilliant Tourmaline, 1 Brilliant Amethyst, 1 Brilliant Citrine OR 3 Faceted Onyxes
  • Equipped on Weapon: Magical attack +20%
  • Equipped on Body: -30% damage sustained when HP below 30%
  • Equipped as Accessory: +30% to dodge while Casting when HP below 30%

Brilliant Spinel
  • Crafting Requirements: 1 Brilliant Diamond, 1 Brilliant Onyx OR 3 Faceted Spinels
  • Equipped on Weapon: Physical attack +30%
  • Equipped on Body: +40% speed for one turn when interrupted
  • Equipped as Accessory: Begin each turn 30% forward on Timeline