by Flatlin3
I think the rules are quite clear about the Filigree Amulet.page 30 of the rule book:
Filigree Amulet: When you
buy this card, put it in your
discard pile. If it is in your
hand at the end of your turn,
destroy it whether it was
useful or not. If you discard it
or put it back on your deck
before the end of your turn,
do not destroy it. If you draw
the card for some purpose other than putting
into your hand (such as Aird’s Village ability), do
not destroy it. Follow the directions of the effect
that made you draw the card.
buy this card, put it in your
discard pile. If it is in your
hand at the end of your turn,
destroy it whether it was
useful or not. If you discard it
or put it back on your deck
before the end of your turn,
do not destroy it. If you draw
the card for some purpose other than putting
into your hand (such as Aird’s Village ability), do
not destroy it. Follow the directions of the effect
that made you draw the card.
I underlined the interesting part that clearly states that is destroyed in the endstep even if not used. And when resting and preparing you discard cards as usual during end step and not as part of the action. The only way you can save it from being destroyed is to find an effect to discard it during your turn or put it back on top of your deck with the prepare action.