Well, it's perhaps their "Love". Since, when they love you, trust you, and encourage in your all highs and lows, then I think you've the most precious thing in your life. And, besides, their "Elegant" acts, always take my breath away... For example,

1 - When they hold your arm when you both are walking.

2 - Play with their hair.

3 - Act like they're a royal queen - when they're on a date.

4 - Fight for you.

5 - Passionately attempt to achieve their goals/Or, stubborn about them.

All these things I personally like in a woman.