The crafting system in this game is fairly straightforward and without any convolution making it easy to find all the combinations with minimal effort put in.

The Spreadsheet for those who like pretty colors and offline viewable version:
https://docs.google.com/spreadsheets/d/1VJO4Ed_8Ouy2wLQSiLFR9vig_wlbnO5h4UJ94eB7UF8/edit#gid=0

Notes: When combining for a different type keep in mind that a similar tier will result in the same tier for that type.

EX: Tumbled Sapphire + Tumbled Ruby = Tumbled Amethyst.

The highest tier that monsters drop in the game is tumbled.

[color=#1e78ff]
Rough Sapphire
Tumbled Sapphire - Rough Sapphire + Rough Sapphire + Rough Sapphire
Faceted Sapphire - Tumbled Sapphire + Tumbled Sapphire + Tumbled Sapphire
Brilliant Sapphire - Faceted Sapphire + Faceted Sapphire + Faceted Sapphire[/color]


Weapon
[color=#1e78ff]Adds Water damage to melle attacks. Water is strong on fire, weak on lightning
Adds Water damage to melle attacksand increase attack power by 8% . Water is strong on fire, weak on lightning
Adds Water damage to melle attacksand increase attack power by 12% . Water is strong on fire, weak on lightning
Adds Water damage to melle attacksand increase attack power by 16% . Water is strong on fire, weak on lightning[/color]

Armor
[color=#1e78ff]Increase Water damage Resistance by 8%
Increase Water damage Resistance by 14%
Increase Water damage Resistance by 18%
Increase Water damage Resistance by 24%[/color]

Accessory
[color=#1e78ff]Additional 5% chance of evading an attack while casting.
Additional 10% chance of evading an attack while casting.
Additional 15% chance of evading an attack while casting.
Additional 20% chance of evading an attack while casting.[/color]

[color=#cc3636]Rough Ruby
Tumbled Ruby - Rough Ruby + Rough Ruby + Rough Ruby
Faceted Ruby - Tumbled Ruby + Tumbled Ruby + Tumbled Ruby
Brilliant Ruby - Faceted Ruby + Faceted Ruby + Faceted Ruby[/color]

Weapon
[color=#cc3636]Add Fire Damage to melee attacks. Fire is strong on Earth, weak on Water.
Add Fire Damage to melee attacks and increase attack power by 8%. Fire is strong on Earth, weak on Water.
Add Fire Damage to melee attacks and increase attack power by 12%. Fire is strong on Earth, weak on Water.
Add Fire Damage to melee attacks and increase attack power by 16%. Fire is strong on Earth, weak on Water.[/color]

Armor
[color=#cc3636]Increase Fire Damage Resistance by 8%
Increase Fire Damage Resistance by 14%
Increase Fire Damage Resistance by 18%
Increase Fire Damage Resistance by 24%[/color]

Acessory
[color=#cc3636]MAx HP +4
MAx HP +8
MAx HP +12
MAx HP +20[/color]

[color=#00bd00]Rough Emerald
Tumbled Emerald - Rough Emerald + Rough Emerald + Rough Emerald
Faceted Emerald - Tumbled Emerald + Tumbled Emerald + Tumbled Emerald
Brilliant Emerald - Faceted Emerald + Faceted Emerald + Faceted Emerald[/color]

Weapon
[color=#00bd00]Add Lightning damage to melee attacks. Lightning is strong on Water
Add Lightning damage to melee attacks and increase attack power by 8%. Lightning is strong on Water
Add Lightning damage to melee attacks and increase attack power by 12%. Lightning is strong on Water
Add Lightning damage to melee attacks and increase attack power by 16%. Lightning is strong on Water[/color]

Armor
[color=#00bd00]Increase Earth damage resistance by 8%
Increase Earth damage resistance by 14%
Increase Earth damage resistance by 18%
Increase Earth damage resistance by 24%[/color]

Acessory
[color=#00bd00]Max MP +2
Max MP +4
Max MP +6
Max MP +8[/color]

[color=#00c7c7]Rough Tourmaline - [color=#1e78ff]Rough Sapphire[/color] + [color=#00bd00]Rough Emerald[/color]
Tumbled Tourmaline - Rough Tourmaline + Rough Tourmaline + Rough Tourmaline
Faceted Tourmaline - Tumbled Tourmaline + Tumbled Tourmaline + Tumbled Tourmaline
Brilliant Tourmaline - Faceted Tourmaline + Faceted Tourmaline + Faceted Tourmaline[/color]

Weapon
[color=#00c7c7]Attacks have a 5% chance to cause paralysis for 3 seconds.
Attacks have a 10% chance to cause paralysis for 3 seconds.
Attacks have a 15% chance to cause paralysis for 6 seconds.
Attacks have a 20% chance to cause paralysis for 6 seconds.[/color]

Armor
[color=#00c7c7]Reduce magical Damage by 5%
Reduce magical Damage by 10%
Reduce magical Damage by 15%
Reduce magical Damage by 20%[/color]

Acessory
[color=#00c7c7]Increase magic by 2
Increase magic by 4
Increase magic by 6
Increase magic by 8[/color]

[color=#f235ff]Rough Amethyst - [color=#cc3636]Rough Ruby[/color] +[color=#1e78ff] Rough Sapphire[/color]
Tumbled Amethyst - Rough Amethyst + Rough Amethyst + Rough Amethyst
Faceted Amethyst - Tumbled Amethyst + Tumbled Amethyst + Tumbled Amethyst
Brilliant Amethyst - Faceted Amethyst + Faceted Amethyst + Faceted Amethyst[/color]


Weapon
[color=#f235ff]Increase physical damage by 20% when hp drops below 20%.
Increase physical damage by 30% when hp drops below 20%.
Increase physical damage by 20% when hp drops below 30%.
Increase physical damage by 30% when hp drops below 30%.[/color]

Armor
[color=#f235ff]Reduce physical damage 5%.
Reduce physical damage 10%.
Reduce physical damage 15%.
Reduce physical damage 20%.[/color]

Acessory
[color=#f235ff]Increase magical damage by 20% when HP drops below 20%.
Increase magical damage by 30% when HP drops below 20%.
Increase magical damage by 20% when HP drops below 30%.
Increase magical damage by 30% when HP drops below 30%.[/color]

[color=#bf9000]Rough Citrine - [color=#cc3636]Rough Ruby[/color] + [color=#00bd00]Rough Emerald[/color]
Tumbled Citrine - Rough Citrine + Rough Citrine + Rough Citrine
Faceted Citrine - Tumbled Citrine + Tumbled Citrine + Tumbled Citrine
Brilliant Citrine - Faceted Citrine + Faceted Citrine + Faceted Citrine[/color]

Weapon
[color=#bf9000]Add Light damage to melee attacks. Light is strong on Dark.
Add Light damage to melee attacks and increase attack power by 10%. Light is strong on Dark.
Add Light damage to melee attacks and increase attack power by 15%. Light is strong on Dark.
Add Light damage to melee attacks and increase attack power by 20%. Light is strong on Dark.[/color]

Armor
[color=#bf9000]Increase chance of dodging (%) by 5 when defending for 1 turn
Increase chance of dodging (%) by 10 when defending for 1 turn
Increase chance of dodging (%) by 15 when defending for 1 turn
Increase chance of dodging (%) by 20 when defending for 1 turn[/color]

Acessory
[color=#bf9000]Increase by 5% the chance to bump the targeted dark backward on the timeline.
Increase by 10% the chance to bump the targeted dark backward on the timeline.
Increase by 15% the chance to bump the targeted dark backward on the timeline.
Increase by 20% the chance to bump the targeted dark backward on the timeline.[/color]

[color=#ffffff]Rough Diamond[/color] - [color=]Rough Sapphire[/color] + [color=#cc3636]Rough Ruby[/color] + [color=#00bd00]Rough Emerald[/color]
[color=#ffffff]Tumbled Diamond - Rough Diamond + Rough Diamond + Rough Diamond
Faceted Diamond - Tumbled Diamond + Tumbled Diamond + Tumbled Diamond
Brilliant Diamond - Faceted Diamond + Faceted Diamond + Faceted Diamond[/color]

Weapon
[color=#ffffff]Increase speed by 1.
Increase speed by 2.
Increase speed by 4.
Increase speed by 6.[/color]

Armor
[color=#ffffff]Earn an additional 5% XP from battle.
Earn an additional 10% XP from battle.
Earn an additional 15% XP from battle.
Earn an additional 20% XP from battle.[/color]

Acessory
[color=#ffffff]Increase casting speed by 5%.
Increase casting speed by 6%.
Increase casting speed by 9%.
Increase casting speed by 12%.[/color]

[color=#404040]Rough Onyx - [color=#00c7c7]Rough Tourmaline[/color] + [color=#f235ff]Rough Amethyst[/color] + [color=#bf9000]Rough Citrine[/color]
Tumbled Onyx - Rough Onyx + Rough Onyx + Rough Onyx
Faceted Onyx - Tumbled Onyx + Tumbled Onyx + Tumbled Onyx
Brilliant Onyx - Faceted Onyx + Faceted Onyx + Faceted Onyx[/color]

Weapon
[color=#404040]Increase spell power by 10%.
Increase spell power by 15%.
Increase spell power by 20%.
Increase spell power by 25%.[/color]

Armor
[color=#404040]Reduce physical and magical damage received by 20% when HP drops below 20%.
Reduce physical and magical damage received by 30% when HP drops below 20%.
Reduce physical and magical damage received by 20% when HP drops below 30%.
Reduce physical and magical damage received by 30% when HP drops below 30%.[/color]

Acessory
[color=#404040]Increase chance (%) of dodging by 20% while casting when HP drops below 20%
Increase chance (%) of dodging by 30% while casting when HP drops below 20%
Increase chance (%) of dodging by 20% while casting when HP drops below 30%
Increase chance (%) of dodging by 30% while casting when HP drops below 30%[/color]

[color=#cdb7c0]Rough Spinel - [color=#ffffff]Rough Diamond[/color] + [color=#404040]Rough Onyx[/color]
Tumbled Spinel - Rough Spinel + Rough Spinel + Rough Spinel
Faceted Spinel - Tumbled Spinel + Tumbled Spinel + Tumbled Spinel
Brilliant Spinel - Faceted Spinel + Faceted Spinel + Faceted Spinel[/color]

Weapon
[color=#cdb7c0]Increase attack power by 15%.
Increase attack power by 20%.
Increase attack power by 25%.
Increase attack power by 30%.[/color]

Armor
[color=#cdb7c0]Increase speed by 10% for 1 turn when interrupted.
Increase speed by 20% for 1 turn when interrupted.
Increase speed by 30% for 1 turn when interrupted.
Increase speed by 40% for 1 turn when interrupted.[/color]

Acessory
[color=#cdb7c0]Begin every turn 5% forward on the Timeline
Begin every turn 10% forward on the Timeline
Begin every turn 20% forward on the Timeline
Begin every turn 30% forward on the Timeline[/color]

[color=#c750b2]Princess Stone - [color=#ffffff]Brilliant Diamond[/color] + [color=#404040]Brilliant Onyx[/color] + [color=#cdb7c0]Brilliant Spinel[/color][/color]

Weapon
[color=#c750b2]Increase attack power by 40%.[/color]

Armor
[color=#c750b2]Reduce physical and magical damage by 25%.[/color]

Acessory
[color=#c750b2]Increase spell power by 35%.[/color]


Amount Required to make:

For the Diamond:
1 Brilliant Ruby = 3 Faceted Ruby = 9 Tumbled Ruby = 27 Rough Ruby
Repeat for Emerald and Sapphire
Total = 81

For the Onyx:
1 Brilliant Tourmaline = 27 Sapphire + 27 Emerald = 54
1 Brilliant Amethyst = 27 Sapphire + 27 Ruby = 54
1 Brilliant Citrine = 27 Emerald + 27 Ruby = 54
Total = 162

For the Spinel:
1 Brilliant Diamond = 81
1 Brilliant Onyx = 162
Total = 243
Actual Total required = 486

As you can see the amount required for making this thing is absolutely ridiculous and even assuming you fight every enemy and open every chest your first time through you still will not be able to make one without some grinding. It would be faster to just start a new game plus and open the chests again. An even faster way is to use the gift option.

Erins Stone

Weapon
Increases chance of critical hit by +2%

Armor
Increases chance of dodging by +2%

Accessory
If the wearer dies in battle, they recover +50% HP afterwards.


Requirement:
The Golems Plight DLC