Suddenly, there's a tall silver and blue form in front of me. When did my eyes get unfocused? I can't really see her, but I can see her eyes. Diamond blue.
You know, diamonds aren't actually blue, but the two words together, they usually bring up the right kind of color to mind.
Not sapphire eyes, those are usually wisdom eyes, or calm strength eyes, and they're masculine. Not baby blue, those are innocent eyes. Not icy blue either, because icy blue is evil blue.
No, diamond blue is strong, and purely feminine, bringing to mind concern, maternialism and… well, safety.