Vaishnava Dharmashastra 52.10

52.10

maṇimuktāpravālatāmrarajatāyaḥkāṃsyānāṃ dvādaśāhaṃ kaṇān aśnīyāt ||

(For stealing knowingly) precious stones, pearls or coral, copper, silver, iron, or white copper. he must eat grain separated from the husk for twelve days.