Gem Tang Tsz-kei 鄧紫棋 (born Tang Sze-wing on 16 August 1991), is a Hong Kong singer-songwriter, dancer, musician, and actress. G.E.M., stands for "Get Everybody Moving", G.E.M. the unique name symbolizes her dream of inspiring people through her voice and her music.​
  

In 2008, she became a professional  singer. Enrolled at the HKAPA. The youngest recipient of Commercial Radio's gold award for the Best Female Newcomer, next year, dropped out of HKAPA. Published her first album 18… . She has now debuted three additional studio recorded albums, a best of album and is now on her 2nd world tour. She is also one of Hong Kong's top selling artist and was titled 2012 IFPI Hong Kong Top Selling Female Artist.

 

May 2011, she became the youngest artist to hold a concert at the Hong Kong Coliseum. In 2014, she appeared on Chinese singing competition program I Am a Singer (season 2), and then gained popularity in Greater China. In the same year, she won a Nickelodeon Kids' Choice Award for Favorite Asian Act. In 2015, she was ranked eleventh on the Forbes China Celebrity 100. In 2016, she became the only Asian artist featured in the Forbes 30 Under 30 (Music).

 

May 28, 2017, 25-year-old G.E.M. 鄧紫棋 in the Queen of Hearts World Tour (Wuhan) completed her 100th personal concert of life.