@neorasp—
I'm not sure what you're asking.
I'd agree that someone who were
studious or
knowledgable were not shown
ipso facto to be
gifted, whereas for the most part
intelligence is indeed a
gift.
But, even were intelligence something mostly
achievable or otherwise
acquirable — one could imagine, for example, a medical procedure as in
Flowers for Algernon, or praying 10101 times at some shrine — intelligence would still be distinct from being
studious (motivated to acquire knowledge systematically) or
knowledgeable (possessing a relatively large amount of knowledge).
The term “gifted” is even broader in qualitative application than the Japanese term translated as “genius”, in that one can be said to be
gifted with physical beauty.