The Night I Could Not Remember (Short Story)

"We found you at the station last night. A taxi dropped you off. The driver told me that you were knocked out the entire ride and so he just brought you here." He said and then pulled out a small object from another larger envelope and set it in front of me. I picked it up. It was a gold ring with a large diamond in the middle with smaller diamonds embedded into the side of the ring. I just stared at it and then looked back at the detective. I slid it back to him. He held it up, examining it. "A very fine ring. We found it in your pocket."
"I've never seen it before." I told him. Although I can't remember the night before so maybe I have. It's feels so foreign to feel this way-- to not be able to remember anything-- although my mind was slowly becoming clearer.
"Look, you have got to talk or you are going to be made guilty of stealing this ring." He handed me another cup. I downed that too. It was water.
"I can't."