Company News

The synthesis and technical difficulties in cultivating diamonds

In the 1950s, two synthetic methods for cultivating diamonds were successfully developed, one was the High Temperature High Pressure (HTHP) method, and the other was the Chemical Vapor Deposition (CVD) method. Due to their excellent quality, it was difficult to distinguish them from natural diamonds based on their appearance.

The high-temperature and high-pressure method, also known as the seed crystal catalyst method, uses ultrafine graphite powder and catalysts as raw materials. Initially, due to outdated technology, diamond merchants could use a very simple way to determine whether diamonds were formed by laboratory cultivation. Due to the presence of residual metal crystals during the synthesis process inside the cultivated diamonds, diamond merchants can use strong magnets to suck up the diamonds. With technological progress, this method is no longer suitable for distinguishing between high-temperature and high-pressure methods for cultivating diamonds. The total carat number of diamonds produced by the high-temperature and high-pressure method in China has ranked first in the world for 18 consecutive years, but this method still has drawbacks: the uniformity and yield rate of cultivation are less than 30%, and it has size limits.

The chemical meteorological deposition method uses the principle of microwave heating to continuously deposit carbon atoms in methane onto the diamond substrate, cultivating the diamond to grow layer by layer, and the diamond will rapidly grow on the substrate. Carbon can be deposited from a mixture of carbon containing gases into a diamond matrix at very low pressure and relatively low temperature.

Due to the rapid expansion of technological advantages, the chemical vapor deposition method has added dozens of factories in China to produce and cultivate diamonds through this technology within a year. However, the growth rate and quality of the chemical vapor deposition method are closely related, with the key factor affecting the final quality - crystal seeds. The seeds used to cultivate diamond growth still need to be imported in large quantities. After unremitting efforts and a strong research team as the backing, Demont Company has overcome this bottleneck technical problem. The quality of our crystal seeds can be guaranteed to be on par with well-known foreign brands, but the supply cycle is greatly shortened. Moreover, due to the well-established testing equipment, we can quickly respond to your after-sales needs.

If you have any relevant needs, please do not hesitate to contact us, and we will provide you with professional customized solutions!