Often these pins are pansies or other flowers but here you have a unique find of a 'Good Luck' 4 Leaf Clover. Just look at the other side and you will see the care with which it was made.
This pin has a removable clasp that would allow you to add this pin to a string of beads or pearls. The pin is a balanced 1 3/8" by 1 3/8" and weighs a substantial 8.3 grams.
It sports a 0.20 CT Old European Cut Diamond which is 'H-I' and VS 2. It is in beautiful condition save for a very minor loss of enamel on the second leaf. These enamel pins are often much more damaged than this one is.
Pieces which are classic for a time period are preferred in any collection. Especially when they are as beautiful as this pin.