Well are there supposed to be some special virtues? Maybe they were merely an example of fine craftsmanship (ok, crafts-elf-ship
) of Lorien.
What seems more interesting to me is why didn't Galadriel and Celeborn prepare anything for Gimli? I'm sure they could have given him a Golden belt too. It's almost as if Galadriel foresaw that he will become an Elf-friend, or at least expected him to show the politeness of Dwarves.