Defense. Thunder. Anything with defense or taking damage.
Emerald
HP. Stun. Anything with healing.
Amethyst
SP. Time-Space magic. Anything that uses SP, viz. charge attacks, tribal skills, rings. Note that it is about the rings themselves, not the spells being cast.
Onyx
Gil. Anything with absorbing or stealing.
Crystal
Experience. Anything with regeneration or good fortune.
Crafting Example[]
Every weapon, armor, and accessory has a specific set of bonuses for each level of quality. The quality is determined by the gem used. For example crafting a (Clavat) Hatchet with a (non-Petite) Gem will yield three star quality.
A *** Hachet has these forms:
ATK Boost 3
ATK Boost 5
SP Boost 3
SP Boost 5
ATK Boost 3 + SP Boost 3
ATK Boost 3 + HP Absorb Atk. 3
SP Boost 5 + HP Absorb Atk. 3
When the Hatchet is crafted one of these forms will be chosen at random. However gems will increase the chances of Bonuses they are related. Continuing with this example; Ruby will favor forms with ATK Boost, Amethyst with SP Boost, while Onyx for HP Absorb Atk. Priority for Gems, Bonuses, and actual probabilities are unknown.
Boosts[]
Name
Image
Max
Gem
In-game description
ATK Boost
5
Ruby
Increases offensive power.
MAG Boost
5
Sapphire
Increases spell power.
DEF Boost
5
Citrine
Increases defensive power.
HP Boost
5
Emerald
Increases maximum HP.
SP Boost
5
Amethyst
Increases maximum SP.
Anti-Burn Boost
3
Ruby
Increases resistance to fire. Reduces damage from burning.
Anti-Frost Boost
3
Sapphire
Increases resistance to ice. Reduces damage from freezing.
Anti-Zap Boost
3
Citrine
Increases resistance to thunder. Reduces damage from paralysis.
Anti-Stun Boost
3
Emerald
Reduces chance of being stunned.
Anti-Warp Boost
3
Amethyst
Resists space-time manipulation. Effective against Slow and Gravity.
Anti-Dark Boost
3
Onyx
Resists damage from black magic. Effective against Poison, Blind, Curse, and Doom.
Arm Boost
3
Ruby
Enables one to lift heavier enemies and hang by the arms for longer periods of time.
Body Boost
3
Citrine
Increases endurance and reduces damage reactions.
Focus Boost
3
Sapphire
Reduces damage received while casting spells.
Impact Boost
3
Emerald
Increases chances of stunning enemies.
Eyes, Lore, and Wisdom[]
Name
Image
Max
Gem
In-game description
Warrior's Eye
1
Ruby
Makes party member more aggressive. For story mode only.
Thief's Eye
1
Onyx
Makes party members less prone to be targeted by enemies. For story mode only.
White Mage's Eye
1
Emerald
Makes party members automatically use Cure, Clear, and Raise spells. For story mode only.
Black Mage's Eye
1
Sapphire
Makes party members automatically use magicitie. For story mode only.
Dragoon Lore
3
Ruby
Strengthens aerial attacks. [I.e. jump attacks and down thrusts.]
Monk Wisdom
3
Ruby
Strengthens overhead [when holding on monsters] and underfoot attacks.
Samurai Lore
3
Ruby, Onyx
Facilitates critical hits.
Red Mage Wisdom
3
Sapphire
Shortens effects of status ailments.
Sage Wisdom
3
Sapphire
Prolong status effects on enemies.
Ninja Lore
3
Citrine
Reduces damage from falls.
Scholar Wisdom
3
Emerald
Increases effects of potions and ethers.
Essences, Charge Attacks and Rings[]
Name
Image
Max
Gem
In-game description
Crimson Essence
3
Ruby
Strengthens fire attacks.
Azure Essence
3
Sapphire
Strengthens ice attacks.
Amber Essence
3
Citrine
Strengthens thunder attacks.
Jade Essence
3
Emerald
Increases Recovery Rate. [I.e. Cure, Clear, and Raise.]
Fast Charge
3
Citrine, Amethyst
Speeds up charge time for charge attacks and charge breaks.
Tribal Secrets
3
Amethyst
Reduces SP use for charge attacks, charge breaks, and tribal abilities.
Ring Root
3
Sapphire
Prevents target rings from being broken by bosses.
Ring Speed
3
Onyx, Amethyst
Increases speed of target rings.
HP/SP Skills[]
Name
Max
Max
Gem
In-game description
HP Absorb Atk.
3
Onyx
Converts portion of damage given to enemy into your HP.
SP Absorb Atk.
3
Onyx
Converts portion of damage given to enemy into your SP.
HP Absorb Def.
3
Onyx
Converts portion of damage taken from enemy into your HP.
SP Absorb Def.
3
Onyx
Converts portion of damage taken from enemy into your SP.
HP Regen
3
Crystal
Slowly regenerates your HP.
SP Regen
3
Crystal
Slowly regenerates your SP.
Reward Skills[]
Name
Image
Max
Gem
In-game description
Veggie Might
3
Emerald
Increases effects of vegetables.
Fruit Boot
3
Sapphire
Increases effects of fruits.
Smart Riches
3
Onyx
Slightly increases the amount of gil you pickup.
Smart Valor
3
Crystal
Slightly increases experience points you gain.
Lady Luck
3
Crystal
Increases chance of something good happening to you.