By Cavan Sieczkowski, the Huffington Post

Twins Lucy (left) and Maria Aylmer pose in identical clothing.

Twins Lucy (left) and Maria Aylmer pose in identical clothing.

When Lucy and Maria Aylmer tell people they are twins, disbelief is one response.

The 18-year-olds from Gloucester, U.K. are two of the five children born to their Caucasian father and Jamaican mother. While their other siblings have a blend of features from their parents, Lucy and Maria are opposites: Lucy has fair skin and red hair, while Maria has caramel skin and dark hair.

No one ever believes we are twins because I am white and Maria is black,” Lucy said, according to World Wide Features. “Even when we dress alike, we still don’t even look like sisters, let alone twins.”

Fraternal twins develop from two eggs fertilized by separate sperm cells. The BBC reports that for a biracial couple expecting twins, there is about a 1 in 500 chance those twins will have different skin colors.

The Aylmers are proud of their uniqueness.

“Now we have grown older, even though we still look so different, the bond between us is much stronger,” Lucy said. “Now we are proud of the fact that we are each other’s twin sister.”

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