Hey Tina,
I'd like to help you out on this one! As an English student, I've proofread many of my fellow students' stories, especially during 'Creative Writing'. I guess three years of university education make me the right person to help you.
I will keep your story about the pearl intact and will focus on grammar and phrasing, so that your story seems to be written by a near-native and the idea and structure are still your own.
If you're interested in co-working on your story, please contact me to discuss further details. I'd like to know when you would like your project to be completed, so that I can start immediately.
Yours,
Anouschka from the Netherlands