The Rogelio 3 piece circle metal accent shelf is exactly what I was looking for for my 46” round kitchen window.

It is very lightweight metal and has two spots to nailscrew it to a wall. I chose to place it on a window sill and did not need the mounting brackets. The chicken wire covering the back of the shelf prevents your knick knacks from falling through and it also adds a bit of dimension.

I do think it is a bit expensive for the quality of craftsmanship but there are very few options available in round shelves this large.