Diamonds are apparently not all the same. Scientists have revealed that the world's largest and purest forms of diamonds are hidden inside molten metal, deep within Earth's layers.

In this new study, scientists from the Gemological Institute of America revealed that the biggest and rarest diamonds are created differently from smaller ones.

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According to the lead author of the study, Evan Smith from the Gemological Institute of America, upon mining these diamonds, it has been noted for a long time how the larger diamonds appear a bit different from the others.

These massive, deep-rooted diamonds are in a league of their own compared to those diamonds normally seen in engagement rings.

Scientists have obtained these massive, rare diamonds to study them.

The most expensive diamonds are dense and pure with a few traces of impurities. They are made from carbon.

However, diamonds contain offcuts that can provide clues about how they were originally formed. This means that these offcuts are essential in providing clues about where a large diamond may have come from, which is most likely a very big and pure diamond.

These diamond offcuts known as CLIPPIR diamonds apparently possess traces of metal that only forms within enormous forces and pressure deep within the planet's mantle.

Smith said this is the first time that scientists obtained offcuts like these and were successful in finding inclusions such as non-diamond material trapped in the formation process.

These minerals serve as clues that also give an estimate of how deep these rare diamonds form, which can be as far as 750 kilometers from the Earth's surface, or about three times deeper than less brilliant, smaller diamonds.

Apart from this, these diamonds also contain surprising amounts of metal like iron which suggests that they are formed in a deeper place within the Earth's mantle. Smith said this is still a scientific mystery as it reveals how that deeper parts of Earth supports this metallic process.

These metals apparently play a major a role in the purity of diamonds as these pockets of molten metal can greatly affect how diamonds can grow into massive sizes.

Smith also revealed that metallic iron is effective in dissolving carbon, as carbon can significantly increase in size even in just a small pocket of liquid metal.

This new study was published in the journal Science.