Diamonds are finely processed products of diamonds, which are the hardest and simplest gemstones in the world. They are natural crystals composed of carbon elements and have a cubic structure. Its composition is basically the same as that of common coal, pencil lead, and sugar. Carbon element crystallizes into graphite (black) at higher temperatures and pressures, while it crystallizes into precious diamonds (colorless) at high temperatures, extremely high pressure, and reducing environments (usually a hypoxic environment).
The standards for measuring the rarity and quality of a diamond mainly have four dimensions, namely weight (CARAT), clarity (CLARITY), color (COLOR), and cut (CUT), which is commonly known as the "4C standard".
The jewelry testing agency issues a diamond certificate based on the 4C standard, which in turn determines the price of the diamond.