What does it mean if a girl says "you're a gem"?

This girl I met recently who I've been hanging out with and texting said "you're a gem" after I gave her a pep talk about her project she's been working on. The signs and indicators of interest are there for the most part- was this flirty?
Yes, it's flirty
No, she was just thanking you
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What does it mean if a girl says "you're a gem"?
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