1. Positive: When something/someone resembles the quality of a fine jewel, either in terms of behaviour or appearance.
2. Negative: Used with sarcasm to describe someone/something that is definately not possessing the good/rare qualitites of a precious jewel.
1. You know what, our freind Juanita is such a nice pal, she is a true gem.
2. -Look at that creepy man across the road eating dog poo!!
-Wow. That's a GEM - straight from the necklace.
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