Amulet of Mighty Fists and Rags to Riches

[pad300]

Ok, assume I have an amulet of mighty fists +1. If someone cast Rags to Riches on it, does it (temporarily) become a amulet of Mighty Fists +2? (Even though the enhancement bonus of the amulet is not actually applied to the amulet itself, but rather the natural weapons of the user...)

[Java Man]

Looking at the target line for the spell "Target 1 weapon, suit or armor, shield, tool, or skill kit touched/5 levels", it appears that the amulet is not a valid target.