I like the idea of Bijou much better than the reality. I've also heard that
les bijoux is a slang term in French that pretty much is the same in English: the "Family Jewels." (Except Bijou and Bijoux sound the same.) Of the two, I prefer Jewel, which is something of a GP - I could never use it myself, due to the Jewel grocery store chain that's prominent in my region.
More likely, I'd use the actual name of a particular gemstone (e.g. Emerald or Sapphire) over a name meaning gemstone.
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