If you can break the gem, than the gem is a fake.
If you mean gem as in a great thing, then Youkon's known gem in potatoes. The mineral gem, however, is gold.
cameo is a sculpted gem
Diamond is Popular & valuble of all gemstones. Ruby is a valuble gem too.
A ruby is a type of valuble gem stone. A taco is a food.
Probably a diamond.
Most Valuble Primate
Well as my teacher told me, the most rare gem is the ruby. Diamond is the most expensive gem as told while the Ruby is the hardest gem to find.
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Currently its dwindling oil reserves.