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Because this Alchemist's stone has a creation level of 315.....
No it doesn't.
If you think it does, please back this up with a link.
As far as I know, the Alchemists' Stone no longer exists. It was taken out in Patch 1.4. That is a loooong time ago. To give you an idea of how long, that was the patch that first allowed Arcanite Transmutes. At that time, the Alchemists' Stone was turned into the Philosopher's Stone.
Even on allakhazam, it says 300 skill on the "deprecated item" of the Alchemists' Stone.
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Alchemists can now transmute thorium and arcane crystals into arcanite. This is the only way to acquire this rare material.
...
Alchemist's Stone has become Philosophers' Stone.
http://www.wowwiki.com/Patch_18-Sep-2004_(Release_Notes)#Professions: