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Since diamonds are most rare, indicator minerals are the only way to predict -- sometimes unsuccessfully -- where a miner might locate diamonds.
The pipes are always required, since that's how diamonds are pushed up to the surface from earth's upper mantle, and kimberlite is not the only indicator mineral. (Link, below.)
Diamond formation does not occur in the pipes: it occurs in cratons. From Wikipedia:
"The correct combination of temperature and pressure is only found in the thick, ancient, and stable parts of continental plates where regions of lithosphere known as cratons exist. Long residence in the cratonic lithosphere allows diamond crystals to grow larger."
You can read more about cratons, below.
What else can I help you with?
Which layer of earth forms diamonds?
The vast majority of diamonds form within the Earth's lithospheric mantle at depths of around 150 to 190 km. Volcanic activity brings them to the surface in the form of volcanic pipes known as kimberlite or lamproite pipes.
What layer do diamonds form in the Earth?
The vast majority of diamonds form within the Earth's lithospheric mantle at depths of around 150 to 190 km. Volcanic pipes bring them to the surface with kimberlite or lamproite in the pipes. Diamonds are formed from carbon.
Do pav'e diamonds have inclusions?
Pave is a form of setting, and any gemstone can be set in this form, including diamonds with -- or without -- inclusions.
How do kimberlite pipes and diamonds form?
Kimberlite pipes form when magma rises from deep within the Earth's mantle and rapidly reaches the surface, carrying diamonds and other minerals with it. The extreme pressure and temperature inside the mantle crystalize carbon atoms into diamonds within the kimberlite magma. When the kimberlite erupts onto the surface, it brings diamonds along, creating diamond deposits.
What landform are diamonds found?
Diamonds are typically found in kimberlite pipes, which are cone-shaped volcanic rock formations that form deep in the Earth's mantle and are brought to the surface through volcanic eruptions. Diamonds can also be found in alluvial deposits, where they have been eroded from the original source rock and are concentrated in riverbeds or coastal areas.
Do all volcanoes have diamonds?
No volcano produces diamonds. Diamonds are erupted to the surface of the earth through volcanic pipes, which look like upside-down volcanoes. These pipes erupt indicator minerals, some of which include diamonds.
Are there diamonds in volcanic tubes?
Only in some. Most diamond mines are in or near formations called Kimberlite Pipes, which form as a result of a rather unusual type of volcanic acvtivty that has not beem witnessed in human history. These volcanoes do not form the diamonds, but rather bring the diamonds up from great depths.
What allows diamonds to form in the mantle?
Overburden or lithostatic pressure.
Diamonds are pure form from what element?
Diamonds are the crystaline form of Carbon.
Why are diamonds found in coal mines?
Diamonds are found in coal mines because both diamonds and coal form under similar geologic conditions deep within the Earth's crust. When the intense heat and pressure are present during the formation of coal, it provides an environment where diamonds can also crystallize. This is why diamonds can occasionally be found in coal mines.
What is the possessive form of the word diamonds?
The possessive form for the plural noun diamonds is diamonds'.Example: I had the diamonds' settings checked by a jeweler.
Do diamonds form from iron?
No, diamonds are formed from carbon.
