For your second question its Diamonds,Rubys, Emeralds. And for your first question its :Minerals are natural: These substances that form without any human help.
Minerals are solid: They don't droop or melt or evaporate.
Minerals are inorganic: They aren't carbon compounds like those found in living things.
Minerals are crystalline: They have a distinct recipe and arrangement of atoms.
Minerals are solid inorganic substances of natural occurrences. Examples of minerals that would be considered gems are: Alexandrite, Diamond, Lapis, Paraiba, Ruby, and Topaz. There's 80, those are just a few.
