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一：What is CVD diamond? What is the difference between CVD lab grown diamonds and natural diamonds?
CVD diamond is a polycrystalline diamond synthesized from diamond crystals with a diameter of 10 to 30 nanometers. Simply put, it is a laboratory-grown diamond.
二：The difference between CVD grown diamonds and natural diamonds
1. Source: CVD lab-grown diamonds can be understood as diamonds that are manufactured by artificially simulating the growth environment of diamonds and have the same composition as natural diamonds, that is, laboratory diamonds. Authoritative laboratories can identify and distinguish them. The production method is CVD lab-grown diamonds and natural diamonds. The difference between diamonds. Natural diamonds are of course precious gemstones processed from diamonds and are also valuable. Natural diamonds grow under a range of temperature and pressure conditions. The temperature is higher than that used to grow diamonds using CVD. At high temperatures, diamonds grow as octahedral crystals, but at lower laboratory temperatures they grow as crystals containing both octahedral and cubic crystal faces.
2.Structure: The difference between CVD lab-grown diamonds and natural diamonds is that one is naturally formed and the other is artificially processed, but the ingredients are the same, both are pure carbon structures, and the hardness is the same. It is said that there are other artificial diamonds that are harder than natural diamonds. The Mohs hardness of natural diamond is 10, which is the hardest material in nature.
3.Price: The price difference between natural diamonds and CVD lab-grown diamonds. Price is a reflection of value. Needless to say, the value of natural diamonds. People who don’t know about CVD lab-grown diamonds may think that they are very cheap. In fact, this is not the case. The production conditions of CVD lab-grown diamonds are harsh, so the cost of produced CVD lab-grown diamonds is also relatively high. Even if the conditions are relatively mature now, one carat of CVD lab -grown diamonds also cost several thousand yuan, while natural diamonds cost as little as 20,000 to 30,000 yuan per carat, and as much as 70,000 to 80,000 yuan per carat. It mainly depends on the quality of the diamond.
4. Quality: Because CVD lab-grown diamonds are artificially processed, their clarity and color will be better than ordinary diamonds. This is also the difference between CVD lab-grown diamonds and pure natural diamonds. Color and clarity have a great influence on the price of diamonds. The quality of natural diamonds cannot be generalized. There are good and bad diamonds. The quality of CVD lab-grown diamonds is often better, and the brilliance produced by CVD lab-grown diamonds is even better.
5.Size: CVD cultivated diamonds can produce more large diamonds, while large natural diamonds are rare and expensive
6.Processing: There are two main methods for processing CVD lab grown diamonds: high temperature and high pressure (HPHT ) and chemical vapor deposition (CVD ). The chemical vapor deposition method is suitable for producing large carat diamonds (mainly 1 carat). The chemical vapor deposition method uses microwave heating, discharge and other methods to activate carbon-based gases, such as methane, to dissociate carbon atoms and hydrogen atoms, and then combine the free carbon atoms to form diamonds. Usually CVD synthetic diamonds are carried out under low pressure and high temperature conditions. The pressure is generally less than one atmosphere and the temperature is about 1000 degrees.
三：Can CVD diamonds be seen with the naked eye?
The first point that must be made clear is that the chemical composition of CVD diamonds is carbon, which is exactly the same as natural diamonds. However, CVD diamonds are synthetic diamonds through technical means, rather than naturally formed during geological changes. CVD diamonds are exactly the same as natural diamonds in terms of chemical composition, crystal structure, optical properties and physical properties. To use a very appropriate metaphor, the relationship between natural diamonds and CVD diamonds is more like that of human clones. CVD diamonds are truly diamonds. Therefore there is no problem of being seen. However, because the growth rate of CVD diamonds is much higher than that of natural diamonds, the fluorescence displayed by the spectrum under the illumination of high-tech equipment will be slightly different. However, this equipment is not a top diamond appraisal institution, and ordinary people do not have it of this kind of equipment.
