What you are asking is: Who was the original owner of the jewels in the thief's grandmother? It's grandma. According to China Book Network, Grandma is an international jewel thief, a black cat with an elegant name. She stole 90% of the jewels in the world, but only one batch of jewels was not stolen. A particularly humorous novel, written by Granny Williams. Through the story of the little boy Ben and his grandmother, the book shows the irreplaceable affection between grandparents and grandchildren.