- When referingreferring to colours, tone and shade are pretty close in meaning to me. If I were to make a difference, I'd say that shade is more about the detailed nuance of the colour, while tone can describe broader differences. If you say “various shades of blue”, you could use “tones” here (it feels less natural to me, but it works). If you say “in tones of green and red”, you couldn't substitute “shades” in that example.
- One’s skin is light-toned, but the person is fair-complected (or fair-complexioned)