Clover or the Trefoil has many meanings throughout history. In Christianity it symbolizes the Trinity, which is why some Gothic churces have a trefoil groundplan. Often the shamrock is recognised as the symbol for Ireland, because it is linked to the Ireland's patron saint St Patrick.
But Lumidoro believes this is a Trefle, the French version, that represents past, present and future and, most importantly; abundance. So it is a bringer of luck, despite it having only three leaves. This 19th century clover pin is sure to bring the wearer luck. You could pin it on your way to a card game, bridge perhaps? Or maybe just give it to someone you wish the best of luck. whomever the new owner, this dainty compagnon will embellish any tie or blouse.