Metal garden table with mosaic top, needs attention (Fobbing SS17)

This is a metal circular garden table with a mosaic top. Diameter is 43 inches. Several of the mosaic pieces have come loose. We have most of them but about 5 are missing. With a bit of time and patience it could be very usable again. There are signs of rust underneath but it is structurally sound. It seems a shame to have to scrap it.