How Are Diamonds Made?

Diamonds, symbols of eternity and power, are among the most precious and rare minerals on Earth. The journey of a diamond's formation and existence spans millions of years, requiring special geological conditions.

Not only originating from the depths of the earth, diamonds are also found in the universe, and recently, humans have successfully developed methods for creating artificial diamonds in laboratories. In this article, Jemmia will take you through the process of diamond creation !

How are diamonds formed underground?

Natural diamonds are formed from carbon elements under extremely harsh physical conditions at depths of 140 to 190 km below the Earth's surface. Here, temperatures must reach from 900°C to 1300°C, and pressure must exceed 45 to 60 kilobars. In this environment, carbon transforms into a special crystalline structure, known as the diamond lattice – the hardest known material in the world.

The organic carbon source involved in this process can originate from the decomposition of ancient organisms in the deep sea. Tectonic movements in the Earth's crust have pushed carbon deeper, where it is forced to restructure under high pressure and temperature to create diamonds.

Once formed, diamonds do not move to the Earth's surface on their own. The presence of diamonds on the surface is explained by special volcanic eruptions called kimberlite and lamproite. Magma flows from deep within the Earth carry diamonds and propel them to the surface at very high speeds, preventing them from transforming into graphite under lower temperatures and pressures on the surface. This is why diamonds are often found in kimberlite mines.

Diamond formation process underground

Diamond formation from outer space

Besides originating from the Earth's interior, diamonds are also found in meteorites that fall to Earth. Many studies have discovered small diamond crystals in the cores of meteorites, formed under high temperature and pressure in outer space. These crystals are not only evidence of the presence of diamonds in the universe but also help scientists determine the origin and journey of meteorites.

More notably, scientists have discovered that diamonds can exist on gas giants like Jupiter, Saturn, and even Uranus and Neptune. On these planets, pressure and temperature conditions can cause carbon atoms to bond into diamonds, and diamond rain may occur in their atmospheres – a miraculous phenomenon that humans can only imagine.

Diamond formation from outer space

Artificial diamond formation process in laboratories

The rarity and high value of natural diamonds have driven humans to find ways to create artificial diamonds in laboratories. The two main methods used to create artificial diamonds are HPHT (High Pressure High Temperature) and CVD (Chemical Vapor Deposition).

The HPHT method simulates the natural diamond formation process by applying extremely high pressure and temperature in a sealed chamber. Diamond powder is dissolved in metals such as iron, nickel, or cobalt, and then undergoes a crystallization process to form synthetic diamonds. After about a month, artificial diamonds will be created, with quality and properties very similar to natural diamonds.

The CVD method uses a different process, where carbon atoms from gas dissociate and accumulate on a surface to form diamond crystals. This process takes place in a vacuum environment, allowing multiple diamond crystals to be created simultaneously in just a few weeks.

Structure and natural diamond extraction process

The crystal structure of a diamond is the result of a special arrangement of carbon atoms. Each carbon atom in a diamond is bonded to four other carbon atoms, forming a three-dimensional lattice with high symmetry. This crystal structure gives diamonds their top hardness on the Mohs scale (10/10 hardness), making diamonds the hardest material ever known.

Diamond extraction typically begins with the search for kimberlite pipes – where diamonds are brought up from deep within the Earth through volcanic eruptions. Geologists often use open-pit mining methods when the overburden of the diamond mine is not too thick. When diamond deposits are located deeper underground, the extraction process becomes more complex and requires advanced technology.

The extraction process involves processing tons of earth and rock to find precious diamonds. Then, they undergo cutting, grinding, and polishing stages to become sparkling gems.

Structure and natural diamond extraction process

Conclusion

The formation of diamonds, from the depths of the earth, outer space, to laboratories, is a magical story of nature's and humanity's creation. Each diamond holds a history of millions of years and invaluable worth. At Jemmia, we not only offer high-quality diamonds but also cherish every story behind each product, from responsible mining to exquisite craftsmanship. Jemmia is proud to be the bridge that brings you perfect diamonds, reflecting elegance and sophistication in your own way.