Amulet of Mighty Fists

Unlike previously, this amulet will now be split up into two.
First, the amulet of Mighty Fists. This amulet will boost unarmed attacks, useful for monks and unarmed fighters, but not so much for druids.
Second, the amulet of Mighty Claws. Unlike the previous amulet, this one will affect natural attacks - allowing druids and creatures a boost to their natural weapons.

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Amulet of Mighty Fists
Aura: faint evocation; CL: 5th
Slot neck; Price 3,000 gp (+1), 12,000 gp (+2), 27,000 gp (+3), 48,000 gp (+4), 75,000 gp (+5)
Weight: ó

Description
This amulet grants an enhancement bonus of +1 to +5 on attack and damage rolls with unarmed attacks.

Alternatively, this amulet can grant melee weapon special abilities, so long as they can be applied to unarmed attacks.
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.

Construction
Requirements Craft Wondrous Item, greater magic fang, creatorís caster level must be at least three times the amuletís bonus, plus any requirements of the melee weapon special abilities;
Cost: 1,500 gp (+1), 6,000 gp (+2), 13,500 gp (+3), 24,000 gp (+4), 37,500 gp (+5)

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Amulet of Mighty Claws
Aura: faint evocation; CL: 5th
Slot neck; 5,000 gp (+1), 20,000 gp (+2), 45,000 gp (+3), 80,000 gp (+4), 125,000 gp (+5)
Weight: ó

Description
This amulet grants an enhancement bonus of +1 to +5 on attack and damage rolls with natural weapons.

Alternatively, this amulet can grant melee weapon special abilities, so long as they can be applied to natural weapons.
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.

Construction
Requirements Craft Wondrous Item, greater magic fang, creatorís caster level must be at least three times the amuletís bonus, plus any requirements of the melee weapon special abilities;
Cost: 2,500 gp (+1), 10,000 gp (+2), 22,500 gp (+3), 40,000 gp (+4), 62,500 gp (+5)

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What if both apply?
Some builds, such as the infamous vampire monk, have both unarmed strikes and natural weapons.
In such a case, the DM should apply the equally infamous common sense.
Following the example, the monk receives benefits from the first amulet for his flurries, but not for his slam or bite.
While the second amulet would enhance his slam and bite attacks, but leave his flurry untouched.

About augmentation crystals
Amulets of Mighty Fists/Claws are treated as magic weapons of equal bonus, to qualify for augmentation crystals.