What Am I?

I make you happy when you first see me,
I shine like a falling star.
Once you get me you will never let me go.
You can’t break me if I’m true,
I am there on your special day.

I’m always with you when you're sleeping and awake,
I’m crystal clear if you keep me safe.
I’ll witness you kiss the love of your life,
You love showing me off to family and friends.
What am I?