Gems

Normal Rings and Amulets

Gem Type	Saving Throw Increase
Greenstone	Poison
Malachite	Disease
Fire Agate	Fire
Aventurine	Electric
Phenlope	Cold
Amethyst	Acid
Feldspar	Death
Garnet	Mind Affecting
Fire Opal	Reflex
Diamond	Fortitude
Ruby	Will
Emerald	Universal

Gem Type	Skill Increase
Alexandrite	Discipline/Taunt
Topaz	Hide/Move Silently
Sapphire	Spellcraft/Concentration

Ability Rings

Alexandrite: For +1 Rings / Amulets
Diamond: For +2 Rings / Amulets
Emerald: For +3 Rings / Amulets

It will take 1, 3, or 5 spells of the ability to enchant the gems.

Bull's Strength: Strength
Cats Grace: Dexterity
Eagle Splendor: Charisma
Endurance: Constitution
Fox Cunning: Intelligence
Owl Wisdom: Wisdom

Making a +1 Ring of Strength Requires:

Ingot(s) of gold
Ring Mold
Enchanted Gem: Enchanted Alexandrite with Bull's Strength