What is the difference between HPHT and CVD?

The essence of diamond cultivation is to extract pure carbon atoms from materials containing carbon in different forms and attach them to diamond structure wafers or seed crystals to form diamond structure crystals.

The high temperature and high pressure method HPHT is to put the diamond seed crystal into the graphite column, and then put it into the high temperature and high pressure environment to simulate the formation of natural diamond, so that the carbon diamond in the graphite adsorption to the original diamond structure of the seed crystal. The blank formed is shown as follows:
High temperature and pressure method HPHT

High temperature and pressure method HPHT

CvD chemometeorological deposition, which separates carbon atoms from methane and deposits them onto wafers.
CvD chemical meteorological deposition method

CvD chemical meteorological deposition method

Natural diamond is in high temperature and high pressure environment, there are a large number of high purity carbon accumulation, naturally formed diamond crystals. There is no human intervention to create existing diamond-structured crystals to accelerate the deposition of carbon atoms, so the 0-1 process is relatively long. Based on the natural environment, the rough diamond is also varied.

Natural diamonds form in different environments, but we only look at the four Cs when buying natural diamonds. Similarly, there is no difference between the way cultivated diamonds are formed and the way they are processed naked. Consumers at the time of purchase, look for the certificate on the line. For those who do this industry, it is necessary to understand some characteristics of high temperature and high pressure and CvD to avoid investment risks. For example, most of the high temperature and high pressure naked drill is DEF color, blank beyond high clarity naked drill proportion is not much, most of the CvD is FGH color, blank output of high clarity naked drill proportion is relatively high. For example, high temperature and high pressure particle size range is relatively wide, can do Bali stone, can also do large carat naked drill. The smallest chip in use at CVD is a 7 x 7 cut and the smallest bare drill is a 1 carat.

You'll see a little white who's just starting out, and you'll ask me for a 50 cent D color VS1 CVD diamond or a 1 carat H color VVS high temperature and high pressure diamond. A listen is small white, although this also has, but the proportion is very small, know not to push these. Some people will ask CvD stone division, can be very responsible to say that below 30 points are basically high temperature and high pressure diamonds, no CvD. But for consumers, buying just one grain, the main thing is to think about spending the least amount of money to get the diamond you want the most. Pay attention to is to buy the cultivation of diamonds, look for 4C, do not know how to look at the bare stone, buy with IGI certificate.

Leave a Comment

Your email address will not be published.