Views:182 Author:Site Editor Publish Time: 2021-06-20 Origin:Site
If you put CVD and HPHT diamonds and lab grown diamonds in front of everyone's eyes, they too are crystal clear, full of fire, and look exactly the same. However, natural diamonds are formed over a billion years or more, while lab grown diamonds are formed in days.
Natural diamonds are formed by the forces of a young earth. The other type comes from laboratories and has essentially the same chemical, physical and optical properties as natural diamonds. By name, they are both referred to as diamonds.
l Definition of diamond：
l we must first understand natural diamonds：
l Let's talk about the laboratory culture of diamonds.
According to the U.S. Federal Trade Commission (FTC) trade guidelines for the gem and jewelry industry, a diamond is defined as a material, not a gemstone, that is essentially a mineral composed of pure carbon, crystallized in an equiangular cubic system.
Although the FTC mentions that diamonds are essentially pure carbon, most natural diamonds contain trace amounts of other elements such as nitrogen and boron. In addition, they often contain inclusions, tiny foreign bodies that are still trapped in diamonds that were formed millions of years ago.
Lab grown diamonds (generally referred to as lab diamonds or man made diamonds) entered the commercial gem and jewelry market about five years ago.
Before we can understand lab grown diamonds, we must first understand natural diamonds.
Natural diamonds were formed under extreme pressure and heat deep in the earth as early as 3 billion years ago. The volcanic activity brought them from the ground to the surface, where they lie in a volcanic rock called kimberlite, waiting for us to mine them. Of these, only about 5% of kimberlite contains enough diamonds to be economically worth mining.
Let's talk about the laboratory culture of diamonds.
In the 1950s, man made diamonds suitable for industrial use were first cultured in laboratories. Gem quality lab grown diamonds first appeared in 1971, but it was not until the mid 2010s that colorless lab grown diamonds entered the gemstone and jewelry markets in significant numbers.
Today, lab grown diamonds are manufactured in two ways. CVD and HPHT.
High Pressure and High Temperature (HPHT) diamonds are produced in a laboratory under high pressure and high temperature conditions that mimic the formation of natural diamonds on earth. This process produces a unique shape of lab grown diamond crystals.
The chemical vapor deposition (CVD) diamond method involves breaking down carbon rich gas molecules (such as methane) into carbon and hydrogen atoms, which are then deposited on the diamond seeds to form square diamond crystals.
Regardless of which method is used to grow the diamond, it usually takes less than a month for most sizes. Most CVD grown diamonds require additional treatments, such as heating or irradiation, to enhance or change their color after cultivation.
Generally, lab grown diamonds weigh no more than 1 carat lab grown diamonds, but as technology and techniques have advanced, larger cultivated diamonds have become available on the market. Many laboratories are constantly setting new records for the weight of cultivated diamonds.