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I was literally named after Jem and the Holograms (Jerrica) and my mum calls me Jem so I'm obviously used to it as a girls name lol.
I think that if you use Gem as an actual first name you would want to pair it with a longer middle name (or perhaps your last name is long. Some suggestions are:

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Gem Arianna
Gem Aubrey
Gem Avery
Gem Elizabeth
Gem Imogen