You can have a cool skin tone even if you have a dark complexion. Cool/darks have blue or purplish veins, but your complexion is darker, so you won't have as much contrast between your hair color, eye color, and skin tone. Your skin is more muted than golden, which is why you look best in the muted shades of green.
Arlenis Sosa is darker with cool undertones. While most people with dark skin are put in the warm category, notice that Sosa's skin looks more brown than golden. Other celebrities with cool/dark skin tone are Alex Wek and Oprah Winfrey.
The best greens for cool/dark skin tones are emerald, hunter green, and teal.
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