There is currently a glitch where the gold amulet, when worn, appears green rather than gold, similar to the amulet of power glitch. This also happens with a gold amulet(unstrung).
A plain gold amulet cannot be enchanted; only jewellery with gems can be enchanted. Gems cannot be added to a gold amulet, because they must be added during the crafting process.
Crafting Gold amulets is a great way to train crafting, because it's fast and you don't lose money, though you don't make too much money either. Significantly more GP can be made by making Necklaces or Bracelets but at slower crafting exp.