The gemstone that is often confused with diamonds is called a cubic zirconia. A person should have their ring checked by a jeweler if they suspect it's a fake.
Natural gemstone diamonds are formed from pure carbon. Often trace minerals are included, and in 'white' diamonds, the trace mineral is often nitrogen, which gives the gemstone a yellow tint. A flawless gemstone diamond may contain another element such as boron, or have been formed with a molecular structure that affects its colour, and these gemstones are the most valuable. Industrial diamonds are formed with visible inclusions of other minerals, which are not often classified. This is because industrial diamonds -- about 80% of all diamonds mined -- have relatively low value as compared to gemstone diamonds.
Gemstone diamonds of whatever colour are transparent.
Diamonds are classified as industrial -- about 80% -- and gemstone quality, the remainder. Gemstone quality diamonds are classified according to cut, clarity, colour and carat weight.
A diamond is a gemstone.
Natural diamonds can be industrial diamonds or gemstone quality diamonds. Gemstone quality diamonds are worth more than industrial diamonds. If by 'industrial', you mean man-made, then a natural diamond will always be more valuable than a man-made diamond of equal carat weight, unless the natural diamond is not of gemstone quality.
According to My Research Diamonds are composed of carbon atoms arranged in a crystal lattice structure. The chemical composition of diamonds consists solely of carbon (C). Each carbon atom in a diamond is bonded to four other carbon atoms in a tetrahedral structure, forming a three-dimensional network of strong covalent bonds. This arrangement gives diamonds their exceptional hardness and unique optical properties. Therefore, unlike many other gemstones, diamonds do not contain additional compounds or elements beyond carbon.
Raw diamonds are not naturally smooth, but may have smooth faces: a polished diamond gemstone is smooth.
Diamonds are not foggy, unless the stone is terribly flawed or included, in which case, its value as a gemstone is not high.
Pave is a form of setting, and any gemstone can be set in this form, including diamonds with -- or without -- inclusions.
About 75% of all diamonds mined are used for industrial purposes: they are not gemstone quality.
The most commonly known are diamonds, but there are other precious and semi-precious gemstone mines in Southern Africa.
Agate is the state gemstone for Louisiana.