Because of the number of rare and unique items, it isn't possible to list them all under a single guide, so for the purpose of this guide we'll concentrate on the Armor first. In all, there are eleven rare and unique armor sets in Diablo. These are:
Arkaine's Valor (Quest Item) - Costs 42,000 - AC 25
Gives the wearer +10 Vitality; -3 Damage from enemies; Fastest hit recovery; Qualifying level to use: n/a
Demonspike Coat (Full Plate Mail - Random Item) - Costs 251,175 - AC 100
Gives the wearer +10 Strength; +50% Resist fire; -6 Damage from enemies; Indestructible; Qualifying level to use: 25
The Gladiator's Bane (Studded Leather Armor - Random Item) - Costs 3,450 - AC 25
Gives the wearer -3 All attributes; -2 Damage from enemies; High durability (135); Qualifying level to use: 6
Leather of Aut (Leather Armor - Random Item) - Costs 10,550 - AC 15
Gives the wearer +5 Strength; -5 Magic; +5 Dexterity; Indestructible; Qualifying level to use: 4
Naj's Light Plate (Plate Mail - Random Item) - Costs 78,700 - AC Item Standard (21)
Gives the wearer +5 Magic; +20 Mana; +20% Resist all; +1 Spell level; No strength requirements; Qualifying level to use: 19
Nightscape (Cape - Random Item) - Costs 11,600 - AC 15
Gives the wearer +3 Dexterity; +20% Resist all; Faster hit recovery; -40% Light radius; Qualifying level to use: 16
The Rainbow Cloak (Cloak - Random Item) - Costs 4,900 - AC 10
Gives the wearer +1 All attributes; +5 Life; +10% Resist all; High durability (27); Qualifying level to use: 2
Scavenger Carapace (Breast Plate - Random Item) - Costs 14,000 - AC -6 to -10
Gives the wearer +5 Dexterity; +40% Resist lightning; -15 Damage from enemies; Qualifying level to use: 13
Sparking Mail (Chain mail - Random Item) - Costs 15,750 - AC 30
Gives the wearer 1-10 Lightning damage; Qualifying level to use: 9
Torn Flesh of Souls (Rags - Random Item) - Costs 4,825 - AC 8
Gives the wearer +10 Vitality; -1 Damage from enemies; Indestructible; Qualifying level to use: 2
Wisdom's Wrap (Robe - Random Item) - Costs 6,200 - AC 15
Gives the wearer +5 Magic; +10 Mana; +25% Resist lightning; -1 Damage from enemies Qualifying level to use: 5