What things are your mementos?

Do you have any mementos?

I've got a valuable thing from my fiance.
This is a kind of diary. when I was going with him, I couldn't meet him frequently for 3 years because he was in a doctoral program.
At that time, I was too hard to wait him, I decided to break with him.
When he realized my heart, he began to keep a diary for me.
So I could catch his love in his diary. Some times I read this one when I fought with him, It gives me consolation. It means a lot to me!!

I want to know your mementos. What things are your mentoes?