Diamonds are elemental crystals formed by crystallization of elemental carbon at extremely high temperatures and pressures. Diamonds are usually formed in the deep mantle layer of the Earth, at depths of about 150 to 200 km, at pressures around 5 GPA. The temperature and pressure of the earth's mantle are very high, and under these extremely high temperatures (above 1000 degrees Celsius), the structure of carbon atoms changes and crystallizes to form diamond crystals. With a hardness of 10 on the Mohs scale, it is the hardest gemstone on the planet. It is also one of the hardest substances, without it. What's even more amazing is that the chemical composition of the world's softest graphite and the hardest diamond is exactly the same!
Under the action of crustal movements and volcanic eruptions, mantle material is brought to the surface with magma, and diamonds are also brought to the surface with the rising eruption of magma in the Earth's interior. After the magma cools, the diamond exists on the surface in the form of magmatic rock. Crustal movements and ** can also cause diamonds to be buried deep and buried deep into the ground again.
The best diamond is one of the most precious gemstones in the world, and its value is mainly affected by four aspects: one is the quality of the diamond's carat, carat is the weight unit of the diamond, and the ** of most diamonds is proportional to its weight. The greater the quality, the more expensive it is; The second is the cut of the diamond, which determines the brilliance and sparkle of the diamond, and affects its beauty; The third is the color of the diamond, the color grade of the diamond ranges from D (colorless) to Z (colored), and the colorless diamond is more precious; The fourth is the clarity of the diamond, which refers to the purity of the inside and surface of the diamond, that is, the degree of flaws of the diamond.
Diamonds symbolize pure love, and diamonds are often seen as a symbol of love and marriage, especially in engagement rings. Due to their rarity and high economic value, diamonds are the first choice for luxury and aristocratic jewelry. It is the best choice for dignitaries and nobles to show their dignity.
Some famous diamonds, because of their historical background has increased their cultural value, such as the story of "Hope Diamond", which confirms that diamonds have a sacrosanct spirituality, which can punish evil and promote good, protect love, keep peace, and prosper careers.
Diamonds are often used as symbols, themes, or figures of speech by literary and artistic masters in literary and artistic works, adding to the cultural connotation of man and nature. 
From the above description, it is not difficult to see that diamonds are the oldest rare and expensive rare noble gemstones in the world. However, diamonds are not only a noble and beautiful gemstone, they also carry a rich cultural history and high economic value.
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