You can boost the attributes of your hero to make them more powerful by attaching gems to them. Gems are magical items that you either find or craft, there are 6 different types of gems and a total of 9 tiers of each gem type. Gems are scattered all over Oz and can be acquired either by completing battles in the Campaign or by using the 'Pool of Wonders'. The gems you find will be random so to get the ones you want to strengthen and customise your character you will need to battle often. Gem Crafting is unlocked at Team Level 6 and involves combining 2 lower level gems together, plus Essence. As your Team Level increases, you will unlock more gems that can be crafted. Below is a list of the different gems and what bonus for Health, Power, Evasion, or Speed they give, what level they unlock, and what is needed to craft them.
Ruby
Common Ruby:
Plus 20 Health / Level 1 / 2 Ruby Ore
Uncommon Ruby:
Plus 40 Health / Level 5 / 2 Common Ruby +20 Health
Rare Ruby:
Plus 65 Health / Level 7 / 2 Uncommon Ruby +40 Health
Radiant Ruby:
Plus 80 Health / Level 8 / 2 Rare Ruby +65 Health
Regal Ruby:
Plus 100 Health / Level 14 / 2 Radiant Ruby +80 Health
Rare Regal Ruby:
Plus 120 Health / Level 20 / 2 Regal Ruby +100 Health
Grand Regal Ruby:
Pus 140 Health / Level 23 / 2 Rare Regal Ruby +120 Health
Noble Ruby:
Plus 160 Health / Level 26 / 2 Grand Regal Ruby +140 Health
Rare Noble Ruby:
Plus 180 Health / Level 29 / 2 Noble Ruby +160 Health
Grand Noble Ruby:
Plus 200 Health / Level 35 / 2 Rare Noble Ruby +180 Health
Sapphire
Common Sapphire:
Plus 5 Power / Level 1 / 2 Sapphire Ore
Uncommon Sapphire:
Plus 10 Power / Level 5 / 2 Common Sapphire +5 Power
Rare Sapphire:
Plus 15 Power / Level 7 / 2 Uncommon Sapphire +10 Power
Radiant Sapphire:
Plus 20 Power / Level 9 / 2 Rare Sapphire +15 Power
Regal Sapphire:
Plus 25 Power / Level 15 / 2 Radiant Sapphire +20 Power
Rare Regal Sapphire:
Plus 30 Power / Level 21 / 2 Regal Sapphire +25 Power
Grand Regal Sapphire:
Plus 35 Power / Level 24 / 2 Rare Regal Sapphire +30 Power
Noble Sapphire:
Plus 40 Power / Level 27 / 2 Grand Regal Sapphire +35 Power
Rare Noble Sapphire:
Plus 45 Power / Level 30 / 2 Noble Sapphire +40 Power
Grand Noble Sapphire:
Plus 50 Power / Level 36 / 2 Rare Noble Sapphire +45 Power
Amethyst
Common Amethyst:
Plus 2 Evasion / Level 1 / 2 Amethyst Ore
Uncommon Amethyst:
Plus 4 Evasion / Level 5 / 2 Common Amethyst +2 Evasion
Rare Amethyst:
Plus 6 Evasion / Level 7 / 2 Uncommon Amethyst +4 Evasion
Radiant Amethyst:
Plus 8 Evasion / Level 10 / 2 Rare Amethyst +6 Evasion
Regal Amethyst:
Plus 10 Evasion / Level 16 / 2 Radiant Amethyst +8 Evasion
Rare Regal Amethyst:
Plus 12 Evasion / Level 22 / 2 Regal Amethyst +10 Evasion
Grand Regal Amethyst:
Plus 14 Evasion / Level 25 / 2 Rare Regal Amethyst +12 Evasion
Noble Amethyst:
Plus 16 Evasion / Level 28 / 2 Grand Regal Amethyst +14 Evasion
Rare Noble Amethyst:
Plus 18 Evasion / Level 31 / 2 Noble Amethyst +16 Evasion
Grand Noble Amethyst:
Plus 20 Evasion / Level 37 / 2 Rare Noble Amethyst +18 Evasion
Topaz
Common Topaz:
Plus 1 Speed / Level 1 / 2 Topaz Ore
Uncommon Topaz:
Plus 2 Speed / Level 5 / 2 Common Topaz +1 Speed
Rare Topaz:
Plus 3 Speed / Level 7 / 2 Uncommon Topaz +2 Speed
Radiant Topaz:
Plus 4 Speed / Level 11 / 2 Rare Topaz +3 Speed
Regal Topaz:
Plus 5 Speed / Level 17 / 2 Radiant Topaz +4 Speed
Rare Regal Topaz:
Plus 6 Speed / Level 21 / 2 Regal Topaz +5 Speed
Grand Regal Topaz:
Plus 7 Speed / Level 25 / 2 Rare Regal Topaz +6 Speed
Noble Topaz:
Plus 8 Speed / Level 28 / 2 Grand Regal Topaz +7 Speed
Rare Noble Topaz:
Plus 9 Speed / Level 32 / 2 Noble Topaz +8 Speed
Grand Noble Topaz:
Plus 10 Speed / Level 38 / 2 Rare Noble Topaz +9 Speed
Opal
Common Opal:
Plus 5 Defense / Level 1 / 2 Opal Ore
Uncommon Opal:
Plus 10 Defense / Level 5 / 2 Common Opal +5 Defense
Rare Opal:
Plus 15 Defense / Level 7 / 2 Uncommon Opal +10 Defense
Radiant Opal:
Plus 20 Defense / Level 12 / 2 Rare Opal +15 Defense
Regal Opal:
Plus 25 Defense / Level 18 / 2 Radiant Opal +20 Defense
Rare Regal Opal:
Plus 30 Defense / Level 22 / 2 Regal Opal +25 Defense
Grand Regal Opal:
Plus 35 Defense / Level 24 / 2 Rare Regal Opal +30 Defense
Noble Opal:
Plus 40 Defense / Level 27 / 2 Grand Regal Opal +35 Defense
Rare Noble Opal:
Plus 45 Defense / Level 33 / 2 Noble Opal +40 Defense
Grand Noble Opal:
Plus 50 Defense / Level 39 / 2 Rare Noble Opal +45 Defense
Diamond
Common Diamond:
Plus 2 Crit Rate / Level 1 / 2 Diamond Ore
Uncommon Diamond:
Plus 4 Crit Rate / Level 5 / 2 Common Diamond +2 Crit Rate
Rare Diamond:
Plus 6 Crit Rate / Level 7 / 2 Uncommon Diamond +4 Crit Rate
Radiant Diamond:
Plus 8 Crit Rate / Level 13 / 2 Rare Diamond +6 Crit Rate
Regal Diamond:
Plus 10 Crit Rate / Level 19 / 2 Radiant Diamond +8 Crit Rate
Rare Regal Diamond:
Plus 12 Crit Rate / Level 20 / 2 Regal Diamond +10 Crit Rate
Grand Regal Diamond:
Plus 14 Crit Rate / Level 23 / 2 Rare Regal Diamond +12 Crit Rate
Noble Diamond:
Plus 16 Crit Rate / Level 26 / 2 Grand Regal Diamond +14 Crit Rate
Rare Noble Diamond:
Plus 18 Crit Rate / Level 34 / 2 Noble Diamond +16 Crit Rate
Grand Noble Diamond:
Plus 20 Crit Rate / Level 40 / 2 Rare Noble Diamond +18 Crit Rate