Suits of armor made of precious materials are more expensive and sometimes grant special effects. You can make leather armor out of dragonhide, wooden armor out of darkwood, and metal armor out of any precious materials except for darkwood. Because armor’s Bulk is reduced when the armor is worn, use its carried Bulk when determining its material Price.
Low-grade items can be used in the creation of magic items of up to 8th level, and they can hold runes of up to 8th level. Standard-grade items can be used to create magic items of up to 15th level and can hold runes of up to 15th level. High-grade items use the purest form of the precious material, and can be used to Craft magic items of any level holding any runes.