Diamonds in the Garden?

I love the lines and patina of these heavy metal diamonds. They have hung on walls indoors and out at my place. I don't know their original purpose. Did I mention they are heavy?

As you can see, the five of them currently call this flower bed their home. Y'all kicked major booty on suggestions for the coat rack. What should I do with these? ($10 each if you want to buy them and show me!)

Happy Thursday!
~Mindy