This is a small lightweight brooch in the shape of an orchid. I may be Sterling because there is a mark of some kind underneath the pin on the back. The mark is in the shape of a fish and there are some numbers in it, but I cannot make them out, and as hard as I tried, I could not get a clear picture of it either. Since I do not know what mark that might be, I have just put the brooch into my unmarked category. It is multidimensional and measures about 1 3/4" by 2". It is in good condition and easy to wear because it is so light.