Studied law at Worcester College, Oxford University prior to training as an actress.
Graduated from the Drama Centre London in 2008.
Was one of three models to reach the final of the first season of Sky One's Project Catwalk, the UK version of Miramax's Project Runway.
Worked as a fashion model to fund her drama school training, appearing in campaigns for Nokia and Selfridges & Co and numerous magazines including Elle, Cosmopolitan and the Sunday Times Style.
Classically trained on the violin and piano, attaining the Diploma of the Associated Board of the Royal Schools of Music on the violin whilst still at school.
In October 2012 she witnessed a murder of a homeless gentleman outside the Putney Bridge Tube station in West London. She stayed with the gentleman while medics and police were called, but he soon expired. In September 2013 she gave evidence in the trial of the defendant.
Appearing on stage in the British premiere of Bertolt Brecht's final play "Turandot" - Hampstead Theatre, London [October 2008]
Filming as a guest star on the Autumn 2009 special of the BBC's Doctor Who (2005), with David Tennant and Lindsay Duncan. [February 2009]
Filming as a new regular on the fourth season of Secret Diary of a Call Girl (2007) with Billie Piper. [August 2010]
In 2015, she starred in the inaugural season of the AMC/Channel 4 drama Humans as the main protagonist, Mia/Anita. That same year, she starred in the French drama Families, as Chen-Lin.
She studied law at Worcester College, Oxford. Following her graduation, she turned down a legal job offer, and enrolled at the Drama Centre London to pursue an acting career.
In 2014, she appeared alongside Chris Pine, Kenneth Branagh, and Keira Knightley in the thriller film Jack Ryan: Shadow Recruit.
Her father is from Hong Kong and her mother from mainland China. Gemma's mother left the country before the Cultural Revolution, passing through Hong Kong before settling in Greenock, Scotland.
Would like to learn Spanish.