Perhaps the finest tangible way of commemorating different stages of a relationship is sanctifying them with jewellery - something you feel best symbolizes the unbroken bond you have shared for so long. 

This obviously differs from person to person, but some ideas worth considering - and even building upon - include gold jewellery to mark your first year together, diamonds to mark your tenth year, platinum jewellery and/or emerald gemstones for your twentieth, Ruby or Garnet stones marking your fortieth, Fancy Blue diamonds for your landmark fiftieth anniversary, and so on.