Item Properties

http://web.archive.org/web/20010306162501/http://uo.stratics.com/enchant.shtml

Armor Enchantments Prefix Suffix
 * Durable +5 to item HP
 * Substantial +10 to item HP
 * Massive +15 to item HP
 * Fortified +20 to item HP
 * Indestructible +25 to item HP
 * Defense +5 (Full Set) / +0.4(Neck, Hands), +0.7(Arms, Head, Legs/Feet), +2.2(Body) to AR
 * Guarding +10 (Full Set) / +0.7(Neck, Hands), +1.4(Arms, Head, Legs/Feet), +4.4(Body) to AR
 * Hardening +15 (Full Set) / +1.1(Neck, Hands), +2.1(Arms, Head, Legs/Feet), +6.6(Body) to AR
 * Fortification +20 (Full Set) / +1.4(Neck, Hands), +2.8(Arms, Head, Legs/Feet), +8.8(Body) to AR
 * Invulnerability +25 (Full Set) / +1.8(Neck, Hands), +3.5(Arms, Head, Legs/Feet), +11.0(Body) to AR

BOLD Suffixes can be considered valuable

Weapon Enchantments Prefix * The bonus is applied to the Archery Skill level (not to Tactics) if the enchanted weapon is a bow or crossbow.
 * Accurate +5.0 to Tactics or +4.6 to Archery*
 * Accurate, Surpassingly +10.0 to Tactics or +9.3 to Archery*
 * Accurate, Eminently +15.0 to Tactics or +14.0 to Archery*
 * Accurate, Exceedingly +20.0 to Tactics or +18.7 to Archery*
 * Accurate, Supremely +25.0 to Tactics or +23.3 to Archery*

Durability Suffix
 * Durable +10 to item HP
 * Substantial +20 to item HP
 * Massive +30 to item HP
 * Fortified +40 to item HP
 * Indestructible +50 to item HP
 * Ruin +1 damage
 * Might +3 damage
 * Force +5 damage
 * Power +7 damage
 * Vanquishing +9 damage

BOLD Suffixes can be considered valuable

Magic Item Properties vs GM Smith Exceptional Items

GM Smith Exceptional weapon have a +4 damage modifier and sit right between Might and Force Magical Items and have +10 item HP. GM Smith Exceptional armor has increased AR but comes with +10 item HP.