A gem is almost always harder than the ore from which it came.
No, it is a gem.
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No it is an ore like gold. Silver comes out of a mine.
Granite is a rock, not a mineral, gem, or ore. It is a type of igneous rock formed from the cooling and solidification of magma beneath the Earth's surface.
A diamond is considered a mineral because it is a naturally occurring solid with a specific chemical composition and crystalline structure. It is not classified as an ore because it does not contain metal or other valuable substances that can be extracted economically.
Diamond is a special molecular arrangement of carbon, a mineral.
Diamond is a special molecular arrangement of carbon, a mineral.
Diamond is an allotrope of the element carbon, so may be classified as a mineral (it can be colored by elemental impurities). About 20% of all diamonds mined are gem-quality stones, leaving the remainder to be classified as industrial diamonds. Diamond is not an ore.
Ore deposits are often associated with hydrothermal processes, where minerals are deposited from hot fluids circulating in the Earth's crust. Gem crystals are often found in igneous and metamorphic rocks, where the conditions for their formation are present, such as high pressure and temperature.
Ruby is classified as both a gem and a mineral. It is a variety of the mineral corundum, which is composed of aluminum oxide. Additionally, rubies can be found in ore deposits, but they are primarily valued and recognized for their gemstone quality.