You don't use a stone.
Train it south of snowpoint city. There is a rock in the top corner of that route. Train it up 1 level there and it will evolve.
from blazica rose: wow thanks for the information i am an a Pokemon breeder and i like to breed eevees the most but sometimes its hard to evolve them. also if you are wondering eevee will also evolve witha waterstone firestone thunderstune and inentirna forset there is a rock with moss on it. train the eevee near that rock and it will evolve also if you make the eevee love you and train it during the night you will get a umbreon if you do the same thing but during the day you will a espeon.
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you cant evolve eevee into glaceon.
You don't use a stone to evolve Eevee into Glaceon, instead you need to head to the grass patches near the Ice Rock that's near Snowpoint City and level it up there and it'll evolve into Glaceon.
eevee does only evolve into glaceon in dimond, pearl, platinum ss and hg
You cant evolve it into glaceon unless you bring an ice stone over from a game that has more stones than silver, (silver doesn't have to many.) after transferring it, eevee will evolve. The best you can do without an ice stone is espeon(if it evolves in day) or umbreon (if it evolves in night).
you use a fire stone on eevee to evolve it into flareon thunder stone = jolton water stone = vaporeon full happenes in day you get espeon night time you get umbreonYou cannot evolve an Eevee into a Glaceon in Pokémon HeartGold, you would have to trade it to either Pokémon Diamond, Pokémon Pearl or Pokémon Platinum and evolve it into a Glaceon there and then trade it back to HeartGold.