The man entered the New China Buffet restaurant in the 3200 block of Peach Orchard Road around 10:40 a.m. June 19, said Richmond County Sheriff's Office Sgt. Paul Evans.
When cashier left her post, the man reached behind the counter and took $50 in one-dollar bills.
The suspect is described as a black man with a bald head and a goatee, between 5-feet 10-inches and 6-feet tall, weighing about 200 pounds.
Anyone with information can contact the Richmond Sheriff's Office at (706) 821-1080.