Shaped Wedding Bands
It is always a good idea to match metal types/purities, for instance if your engagement ring is 9ct Yellow Gold, it would be a good idea to go for a 9ct Yellow or Rose gold band. However, if your ring is Platinum or Palladium, commonly you will be told these can be worn together. It is true that they are both hard metals but they do wear differently, Platinum is much more dense than Palladium. The truth of the matter is any two rings when worn together will wear at one another, by matching the metals the wear on both rings is even. By making a shaped band the wear is minimised as there will be less friction on two rings when they lock/slot into one another.