So far there are only facet-specific artifacts that are stealable of in treasure maps that are level 6 or higher.
These artifacts can only be spawned in Level 6 or 7 treasure map chests. (Ingenious and Diabolical)
Barbaric Axe
Bow Of Kings
Hailstorm
Halberd Of The Dead
Hammer Of Justice
Hunter's Crossbow
Leech Sword
Staff Of Tanks
Whirlwind
Arms Of Replenishment
Gloves Of The Tiger
Helm Of The Scorpion
Leggings Of The Royal Council
Mage Royal
Mages Brace
Shield Of Intellect
Shield Of The Titans
Touch Of Death
Tunic Of Might
Wind Chime Instruments
Goblet Drum
Gold Belt (deco)
Spittoon
Chunk Of Ore
Ancient Troll Mask