The description of gauntlets state.
This metal glove lets you deal lethal damage rather than nonlethal damage with unarmed strikes. A strike with a gauntlet is otherwise considered an unarmed attack. Your opponent cannot use a disarm action to disarm you of gauntlets.
The description of the Amulet states
This amulet grants an enhancement bonus of +1 to +5 on attack and damage rolls with unarmed attacks and natural weapons.
Alternatively, this amulet can grant melee weapon special abilities, so long as they can be applied to unarmed attacks. See Table: Melee Weapon Special Abilities for a list of abilities. Special abilities count as additional bonuses for determining the market value of the item, but do not modify attack or damage bonuses. An amulet of mighty fists cannot have a modified bonus (enhancement bonus plus special ability bonus equivalents) higher than +5. An amulet of mighty fists does not need to have a +1 enhancement bonus to grant a melee weapon special ability.
So my question is, can they stack with each other. For example can I enchant two gauntlets with +5, speed, corrosive, flaming and then also have Spell Stealing, Wounding specials from the amulet?
So each hit would be +5, deal 1d6 acid and 1d6 fire, have a chance to siphon magical protection, and add bleed damage.