The person who took the necklace is:
Because she said she was eating breakfast at McDonalds at 11:15 and McDonalds stops serving breakfast at 10:30. Also, her alibi doesn't match up with her story. Her alibi says that she was at McDonlads, but her statement says that she was at the beach. Another thing was that she said Sam Stealer was stalking her, but he was actually at the Golf Club. Also, Sam wasn't lying when he said he had lost his cloak that morning, Belle stole it so people would think he was the one who stole the necklace. She is a disgrace to the Bill Gates family!