Natasha Knight, 35, of Jamaican-English heritage, and father Michael Singerl, 34, of German heritage, conceived the girls, one black and one white, naturally.
Ms Knight said she was shocked when she saw how different her daughters were.
“When they were born you could see there was a colour difference straight away. We couldn’t believe it,” she said.
“Alicia’s eyes were brown and her hair was dark. Jasmin’s eyes were blue and her hair was white – you could hardly see her hair or her eyebrows.
“We were joking when I was pregnant about what if one baby looked like me and one looked like Michael. We joked about one light one, one dark one, so it was amazing when it actually happened.”