From Lost Fables Wiki
Rubies are exceedingly rare, scarlet red crystals which take on incredible beauty when cut. They are as prized by those seeking to display their wealth as they are by the various militaries in the old world for their ability to produce flames.
Generally speaking, when a gem is used for enchantments, it is either embedded into the metal of the weapon while it cools, or crushed into a fine powder and incorporated into the metal itself as it is forged. Finally, rubies are able to be used for an alchemist's focusing array.
Though they are used frequently in mundane jewelry, rubies are also used in a plethora of different enchanted goods, from tea kettles which boil without benefit of any fire, to swords which spring into burning flames at a thought.
Weaponry and Armor
Weaponry enchanted by rubies tends to either be wreathed in flames or grow red-hot at a command, while armor almost always defends the user from heat or fire.
There are no ruby Artifacts on Anoma, perhaps you can change this.