JEMMA booked her place at the Games after she finished runner-up to friend and rival Ellen Gandy at the British Swimming Championships in London in March.
After finishing third in the 100m final, Jemma needed a top two finish at the Olympic trials at the Olympic Park and managed it in the 200m butterfly final.
London will be Jemma’s second Olympics, she competed for Great Britain at the 2008 Olympics in Beijing in the 100-metre and 200-metre butterfly, as well as the 4x100-metre medley relay, but a medal eluded her.
The former High Tunstall College of Science pupil started swimming with Hartlepool Swimming Club as a youngster and has never looked back.
She accepted an athletic scholarship to attend the University of Florida in America where she competed in the swimming and diving teams at national level.
As her dad is Welsh, Jemma competes for Wales at the Commonwealth Games and bagged a bronze medal in the 100-metre butterfly in the 2010 Commonwealth Games in Delhi.