Sterling silver magnetic back brooch measuring approximately 3" - shown with magenta, cobalt, and gold. since his is a magnetic back, this earring can also be worn as an oversized earring (as seen on model). It does NOT have a traditional pin back, so it will not work on very thick coats, but id does work on most fabrics without damaging them like a tradition pin back would. If you would prefer, a traditional pin back, please specify on the order.