All was well until towards the end of the trip. I'...

All was well until towards the end of the trip. I'd left one of my rings in the room on the side table when I went out, and while it wasn't an expensive ring, it held a lot of sentimental value. I came back that evening and the ring was missing. I know for certain it was on the side table because I was putting on other jewellery and I had to sort out something else at the same time and forgot about my ring. Only plausible option is that it was stolen when housekeeping came in to clean while I was out.