Carbon
Carbonado is also known as black diamond.
A diamond comes to mind. It is a pure form of carbon. Hope this answers your question. Graphite - another form of carbon. Also Gold. And of course, although on rather than in the Earth, the atmospheric gases.
The stone carbonado is also known as black diamond.
Diamond transparency -- also known as clarity -- varies from none to flawless, depending on the quality of the diamond.
Carbon. Diamond and graphite (pencil lead) are allotropes of carbon, meaning different atomic arrangements of the same element. They are also both covalent network solids.
Yes, sometimes.
The number of protons, also known as the atomic number of the element.
jello
Idaho is known as the "Gem State"
Mercury is also known as quicksilver. (Note correct spelling.)
The diamond you reference is also known as the Koh-i-noor. You can read more about it, below.
Diamond, for one. Also, gold, silver, lead, mercury, to name just a few.