This vintage Shamrock pin has 5 leaves, each leaf has 1 marquise and 8 round crystals, the center has one large round crystal surrounded by 6 smaller crystals.  The metal is heavy and not magnetic.

It shows signs of aging but little, if any, use.  The bottom of the stem has a very small white mark which is very smooth, suggesting it was a manufacturing mishap.

Please examine the photos, they are part of the description.

This is from a deceased relative’s collection of things and has been in storage for decades.

This is item 8427