IMO...

The song sounds commercially viable.
It's a happy and uplifting message.
V1 begins with a clear picture of the woman being featured and the song continuously develops an image of her as it progresses.
The music is upbeat and is as good of a match as any, for the lyrics.

Personally, I like these lines.

‘Cause a diamond’s just a rock till it’s been through the fire
She’s the only heart that’s ever taken me higher


FWIW2U....good song