How do I close the clasp ?

GOOD QUESTION! I have never worn this watch, as I can't get it to close either.

The lady watch with a heart shape looks very nice, how does it looks after wearing?

Thank you for your attention. It is a blessing thing to get your likes! This lady rose gold watch with a fashion style heart shape,date window display,30m waterproof,shockproof,high hardness scratch resistant crystal glass and so on. All these make it elegant, beautiful and luxury. It is welcomed by more and more girls and ladies. Attach the real display video of the product. If you meet any questions about our products, please feel free to contact us. It is our greatest honor to serve you. Wish you will have a pleasant shopping experience on Amazon! Sincerely, QBAIZI

Does the watch band change color to black after using several months ?

Not at all. I have had it for a year or more and it's still golden

Does the watch band change color to black after using several months ?

I don't know. I had to purchase a leather watch band because the one that came with the watch was beautiful. I needed a smaller one so I purchased a leather one from Amazon.