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Usable. I worked with someone called Gem once. Hers was actually short for Gemini - one of the more unusual names I've come across - but she was always called Gem. I just had a look at stats here for it and it's been used more on boys than girls, but it seems fairly unisex to me:
Gem Alexandra
Gem Rebecca
Gem Lucy
Charlotte Gem
Frances Gem
Marianne Gem

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