Diamond gift

Bill meets Doug shopping at the mall and sees he has a small gift wrapped box.
“It’s my wife’s birthday tomorrow.” Doug said. “Last week I asked her what she wanted for her birthday.”
“And???” Bill asked.
“Well.. , she said ‘I don’t know, just give me something with diamonds in it’.”
“So what did you get her?” asked Bill.
“I bought her a deck of cards!!”

The robber

Dear John