Regular fire has no effect on horcruxes, or One Rings, or any other powerfully magical object. Chuck the horcrux in your campfire, and you've just got a horcrux that will burn your hand when you pick it up!
The fire that destroyed the diadem was magical "curse fire", either Draco, Crabbe, or Goyle (I forget which) started a magical fire that formed into bizarre shapes and had the power to destroy horcruxes. I presume that Harry and his pals didn't know the spell, or they would have saved themselves a lot of trouble.
“Seventy-seven courses and a regicide, never a wedding like it!
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