Amethyst Tiara

When you defend with a card it remains on the combat chain until the chain closes, therefore you cannot defend with an equipment multiple times on the same combat chain.

When this card is destroyed, it is sent to your graveyard.

The ability becomes a layer on the chain when the combat chain closes.

The Blade Break ability becomes a layer on the chain when the combat chain closes.

The ability goes on the stack when the combat chain closes.