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Same as an apex i believe. But yeah, buyable for 400 gems (apex) or not al all (radiant) and getting 33 back is way out of proportion. I would have expected 100 to be more fair. you could get another mount for it atleast then even if not apex. That seems ok.
It's supposed to be 33% return of its gem value. I believe an apex mount would give you 132 gems. I asked somebody else on the forums about radiant mount duplicates and they got the same amount of gems as an apex mount. I wonder if ZOS goofed and gave it the wrong gem return value, thinking nobody would ever get a duplicate.
Have your friend contact support and ask them what the return value is supposed to be, perhaps they can get compensated if they really did get 33 gems.