Under the huppa dating service
At the birth of a girl, an acacia tree was planted.When the children grew up and were to be married, the poles with which to support their chuppah were made from those very trees.Some rabbis will require that couples use a ring of one solid piece of metal, while others will accept any style of ring or any other object as the official token.The only limits are those set by your imaginations, tastes, and the customs of your communities, so be sure to consult with you rabbi.
This is called "Kabbalat Panim." Jewish tradition likens the couple to a queen and king.
Over the centuries, both the ring style and the finger upon which the ring is placed have varied.