It's wrong to steal things from someone's house.
Christina, a high-schooler from a low income-family, is friends with Kelly whose parents are well-off and own lots of nice jewelry.
Christina wants to wear one of Kelly's necklaces to school.
Christina tells Kelly how pretty her necklace is and asks to borrow it.
While hanging out at Kelly's house, Christina takes one of her necklaces while she's in the bathroom and wears it to school the next day.
Kelly gladly allows Christina to borrow her necklace, telling her that she is always welcomed to her things as long as they are returned.
Kelly notices her necklace on Christina and reports her to the principal before cutting all ties with her.