The size of your hands and fingers will change over your life time and the life of your wedding rings. Tungsten and titanium rings are almost impossible respectively to work with after they have been machined in the factory. The chance of finding anyone near you who can work with them is negligible.
It is traditional for brides to receive two rings, the first is an engagement ring which symbolises a promise of marriage. A wedding ring or commonly referred to as a wedding band is then given during the wedding ceremony, and this band is traditionally known to solidify and strengthen that promise.