Gem was born a month early due to complications with her mother's pregnancy, but was born healthy and named after her starsign, a precious jewel, and her mother's surnames as well as her fathers (although goes by Demetra). Life was enjoyable for the girl despite having a single mother and a father she only saw when he wasn't traveling - him having come from a long line of Gifted Romani which meant he could never stay in one spot for long, not that her mother ever minded.
Life was rather quiet and easy going for the girl, her mother having been teaching for a number of years before she became a headmistress at the school where Gemini began attending certainly helped in some ways, but also hindered her on occasion. Because of this, and the absence of her father she tended to go seeking ways to gain attention, mostly in the form of pranks and practical jokes. When she wasn't feeling so rambunctious though, she would immerse herself into music and writing.
It was when she was about thirteen that Gemini discovered that she had a half-sister through her father's side, when he came to see her. He also visited another girl who turned out to be someone that had been going to the same school as Gemini and only just recently graduated. Excitement at being able to meet a sister was squashed, however, when she was told that the other girl didn't want to know her.
For some time this cause Gemini some sadness, at least until she worked out a perfect plot to meet the girl, who was a Quidditch player for her university and being considered for a local team, and she posed under a different name, as a team water girl. This worked for quite a while, and Gem's identity remained secret until one fateful night just before her 16th birthday when she went out on the town with Katerine. Recognised by a friend, Gemini's cover was blown and she and Kat ended up in a large fight which ended up in a couple of bins being blown up outside the club.
After that, Gemini suffered quite a bit mentally and emotionally. She spent some time with her grandparents, learning about her mother's family heritage, but even that didn't do much for her, and thanks to the fuss back at home she couldn't go anywhere without problems. So Melanie decided to pack them up, and she got in touch with a contact in Australia who she'd met during her years as Headmistress, and so they moved to Victoria.
Not long after arriving, Gemini ran into Frankie Dean, whom she'd met a few times before in LA. They struck up a friendship, which blossomed into romance, despite trouble from his family which resulted in Gem being shot, Frankie being disowned and Gem's mother basically adopting Frankie's sister. To top it off, Gemini was pregnant, and the gunshot wound would make things more difficult.
However, despite a very tricky birth after going into an early and dangerous labour, the family came away still whole and with a new addition, Gabrielle Demetra. Urged on by her mother, Gem continued her study once recovered and managed to graduate with the rest of her class in 2012. Unfortunately, that summer saw her mother get killed, which devastated the young woman.
Gemini decided to take a year off from university, while Frankie continued to attend, and between them they managed to take care of themselves and his younger sister fairly well. However, tragedy seemed to be thick in their lives when the Deans returned to California for the funeral of another of their friends. Something happened, there was a destroyed house, and it appeared that Gemini's boyfriend had been inside.
It took a while for Gem to get over the losses of so many loved ones, and she moved in with Rosmunda and her children with Gabby for a while. She kept kept herself afloat for the sake of her daughter, and in 2015 finally decided to start studying at VMU in Magical Arts. She also has a small band that she plays with regularly in some Melbourne hot spots.