Assignment: The lost diamond
In fact, the incident was planned by a woman who just was released from prison. She had planned it for the last 6 months.
She gathered 3 women. She appointed one of the women to steal, another one to unlock, and another one to reshape a jewel.
They did what they planned and succeeded.
After the stolen diamond was reshaped, they sold it to the pawnshop in town.
They got a lot of money and shared it.