CVD Vs HPHT – How to Tell the Difference


There are two different processes used in the manufacture of lab grown diamonds. One of these is Chemical Vapour Deposition (CVD) and the other is High Pressure, High Temperature (HPHT). While both methods produce perfect diamonds, the primary differences are in the impurities, cost, and morphology of the finished product. This article will discuss both of these processes and how to tell the difference between them.

Same kind of gemstone

There are many differences between HPHT and CVD, but the two processes produce the same kind of gemstone. The major difference between these processes is the quality of the diamonds they produce. In general, diamonds made by the CVD process are thin, translucent, and yellowish in colour. Neither of these processes produce identical sized or shaped diamonds, and as such are not suitable for making diamond jewelry. Because the HPHT process produces the same high-quality gems at lower costs, it is the better choice for most situations.

Two techniques

When it comes to creating diamonds, CVD is cheaper and easier to work with, but there are still significant differences between the two techniques. The main difference between these two methods is in the way the diamonds are formed. When using CVD, a diamond is created with nitrogen while in the HPHT method, it is formed with nitrogen. However, the HPHT method creates gem-quality material.

The main difference between CVD vs HPHT is that the CVD process uses a continuous gas flow instead of a single liquid. In this case, the gas flows around the diamond seed, which is a thin diamond slice. The diamond seed is often formed using the HPHT method. Then, the seeds are placed inside a chamber and heated to several hundred degrees Celsius. The carbon atoms in the gas begin to build around the diamond seed.

Generating diamonds

While the two methods are equally efficient at generating diamonds, the CVD method is cheaper and easier to work with. Typically, CVD diamonds are yellowish, but diamonds grown using HPHT will be colourless. But, the CVD method is more expensive and difficult to use, and the difference between the two methods is not always readily visible. It’s best to consult an expert if you want to purchase a diamond.

The main difference between the two methods is in the quality of the diamonds. When CVD diamonds are produced, they are very thin and transparent, and they have a yellow tinge. The HPHT method, on the other hand, tends to have metal impurities that can affect the appearance of the diamond. The main difference between the two methods is in how diamonds are formed.

Easier to use

Although CVD is cheaper and easier to use, the main differences between the two methods are not always obvious. For example, CVD diamonds are more crystalline and brittle than HPHT diamonds, but the HPHT method is more expensive and more durable than CVD. As such, the CVD method is more common. This is due to the fact that HPHT is more costly, while the CVD method is harder to work with.

Although the CVD method is much easier to work with, it is less expensive. Because of the differences between these two processes, it is important to understand the differences between the two processes when buying a diamond. Considering both the costs and advantages, CVD is the better option. The only difference between these two techniques is in how they are formed. The HPHT method produces diamonds that are yellow, whereas the CVD method creates diamonds that are brown.

Quality of the diamond

The main difference between CVD and HPHT is the quality of the diamond. The CVD method produces diamonds with a thin and transparent structure. This results in a yellowish diamond. The HPHT process is much more expensive, but it produces flawless and faultless diamonds. Both processes can produce the same sized, clarity, and morphology, so it is a good choice for many people.

In Final:

When comparing the CVD vs. HPHT, it is important to know how the diamonds are grown. When compared with CVD diamonds, the former is more attractive. Because it has a cuboctahedron shape, HPHT diamonds are yellowish brown, while the latter is cubic. The difference is minimal in terms of cost. They both produce perfect diamonds, but their development patterns are different.

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