Replying to How can I prove that someone stole from me?

So in English class yesterday I had my iPhone and beats wrapped around it in my backpack. A kid sitting next to me took it out of my backpack and stole the beats. I didn't see him take the headphones, but I did see him toss my phone back into my bag. I didn't really think too much of it because he does shit like that sometimes. Later that day I discovered my headphones were missing and I had no idea where they went. I searched everywhere and came to the conclusion that this kid stole them. Other people in my class confirm that they saw him unravel them from my phone. I have confronted him about it and he still denies it. Do I have enough proof to go to the school about it? Any advice would be appreciated. Thanks!