How CVD Diamond and Hpht Diamond Made?

Generally, CVD Diamond and HPHT synthetic diamond is created within six to eight weeks. On the other hand, Natural diamonds are made by precise and perfectly bond carbon crystal lattices because of which they gain their immense strength. Consistent with scientist’s natural loose diamonds are created under extreme pressure and high temperature, they take about 1 billion to three billion years to make depending on the conditions.

How CVD Diamond and Hpht Diamond Made

Synthetic diamonds, on the other hand, are created within six to eight weeks. These lab-grown diamonds are created during a controlled environment, with the assistance of excellent technology. It’s like a chamber during which the material is put, which can later be converted into a loose diamond.

The chamber replicates the conditions of the earth’s crust, which are needed to make a person made diamond. After a person made diamond is made, it’s cut, polished and graded just like a standard natural diamond.

A person made diamond has a similar physical, chemical, and optical properties as that of a natural loose diamonds. Due to which it becomes nearly impossible to inform the difference between a lab-grown loose diamond and a natural loose diamond, with the naked eye.

Special kinds of equipment and knowledge are required to examine them. Synthetic diamonds are a revolutionary discovery that reshaped the entire diamond market. These loose diamonds have various benefits and somewhat more benefits than natural loose diamonds.

There Are Mainly Two Methods Which Are Opted to Make Synthetic Diamonds:

  1. CVD Diamond Method
  2. HPHT Synthetic Diamond Method

Now let us give you a quick about both of those methods and the way they’re used to create loose diamonds, white diamonds, fancy diamonds.

CVD Diamonds Method

Chemical Vapor Deposition (CVD) may be a more recently developed technique by which diamonds are often grown from a hydrocarbon gas mixture. Within the CVD Diamond process, a thin slice of diamond seed (often an HPHT produced diamond) is placed during a sealed chamber and heated to around 800 degrees Celsius.

The chamber is then filled with a carbon-rich gas (usually methane) alongside other gases. Then, the gases are ionized into plasma using microwaves, lasers, or another technique. The ionization split the molecular bonds within the gases, and the pure carbon adheres to the diamond seed and slowly builds up into a crystal, atom by atom, layer by layer.

The CVD Diamond process has a few advantages over the HPHT process. High pressures aren’t needed, and temperatures, while high, don’t get to be anywhere near as high as with HPHT. Also, CVD diamonds can be grown over larger areas by starting with a bigger diamond seed plate.

Finally, the CVD Diamond process allows for finer control over the environment within the growth chamber and, thus, the properties of the polished diamond. However, even with all of those advantages, the most important known, polished lab-grown CVD diamond as of the time of this writing is only 3.23 carats; it was graded as I color and VS2 clarity.

Intense research is ongoing around the world into the field of Chemical Vapor Deposition, and each day the technology is improving. Only time will tell if and when CVD diamonds will reach a similar size as their HPHT cousins.

CVD Diamond Method Also Has Some Kinds, Which Are:

• Plasma Enhanced Chemical Vapour Decomposition (PECVD)
• Microwave Plasma Chemical Vapour Decomposition (MPCVD)
• Low-pressure Chemical Vapour Decomposition (LPCVD)
• Ultra-High Vacuum Chemical Vapour Decomposition (UHVCVD)

HPHT Synthetic Diamonds Method

How does nature form diamond crystals? Nature does it very deep underground. Diamond growing naturally takes place about 100 miles below the earth’s surface.

Why? Because that’s where the conditions of extremely high pressure and high temperature needed for diamond formation are naturally found. We see diamonds closer to the surface of the earth when a rare kind of deep volcano brings them up to where humans can find and mine them.

HPHT Synthetic Diamonds Method

The first successful synthetic diamond was made by imitating nature with High Pressure/High Temperature (HPHT) manufacturing. There are three basic manufacturing processes used to make HPHT diamonds: the belt press, the cubic press, and, therefore, the split-sphere (BARS) press.

The goal of every process is to make an environment of extremely high and temperature where diamond growth can occur. Each process starts with a little diamond seed, which is placed in carbon and put under very high pressure and temperature to grow the diamond.

The GE invention of the belt press uses an upper and lower anvil to use pressure over 1.5 million pounds per sq in and temperature above 2,000 degrees Celsius. During this environment, the pure carbon melts and begins to make a diamond around the beginner seed.

On December 16, 1954, a belt press was applied to make the first reproducible lab-grown diamond. The diamond was tiny and nowhere near clear enough to be utilized in jewelry, but it had been a start.

As a side note here, we should always mention that even today, most of the man-made diamonds that are produced aren’t of gem quality. They’re made for industrial applications where the amazing properties of a diamond (hardness, thermal conductivity, etc.) are used to make better tools and equipment.

Since the initial success with the belt press, HPHT technology has constantly been advancing. Belt press designs are dramatically scaled up, more modern cubic and split-sphere presses are introduced, which are more efficient, and bigger, more perfect gems are being produced.

As of the time of this writing, the largest gem-quality, faceted, lab-grown diamond has been produced by NDT using the HPHT method with a cubic press. 10.02 carats weight, this incredible diamond is graded as E color and VS1 clarity.

The Elements and Material Utilized to Create a Lab-grown Loose Diamonds Are:

  1. a small diamond seed
  2. Highly refined graphite. ‘
  3. A high-quality enzyme mixture containing metals and powders

When the machine is switched on, due to high pressure and high temperature, the catalyst mixture turns in to a molten form. Which then produces the refined graphite to dissolve in it, and forms various layers over the diamond seed. Then after the cooling is completed, an HPHT synthetic diamond has been formed.

Carry out the HPHT Synthetic Diamond making method, and apply the required conditions, two kinds of machines or press designs are used.

Cubic Press- Creates high temperature and pressure with the help of pistons, which are located throughout the machine and supply pressure from different directions.

Belt Press- during this machine, high pressure is made by two strength pistons. These pistons apply equal pressure in opposite directions.

Why Lab-Grown Diamonds?


For every carat of diamond that’s mined, nearly 100 square feet of land is disturbed, and almost 6000 lbs of mineral waste are made.

Ethically Sourced

All in all, mined diamonds result in 1 injury for every 1,000 workers yearly, while lab-grown diamonds result in zero.

Competitively Priced

No diamond is free, but due to the shorter supply chain, a lab-grown diamond is often anywhere from 20-30% less costly than a mined diamond.

Mining Free

“NO MINING” is required for Lab-created diamonds. Elevate your jewelry with mining free Lab-Grown Diamond.


Lab-created diamonds have similar quality and optical properties as natural diamonds.


Lab-created diamonds contribute excellent value and are cheaper than natural diamonds


Hence to make a synthetic diamond, a controlled environment and specific conditions are needed. Lab-grown loose diamonds are more environment-friendly than natural white diamonds or natural loose diamonds.

Lab-grown diamond doesn’t require intense mining, which degrades the environment, soil, and vegetation. A lab-grown loose diamond is preferred over natural diamonds. And, with the flexibility to make any loose diamond or fancy diamonds, these synthetic diamonds have gained immense popularity.

Why New Grown Diamond is the best place to buy Lab-Grown Diamonds

The reason you want to buy Lab-Grown Diamond from us is quality, but that’s not your sole reason to pick us. Buyers have many other concerns about diamonds, and we try to do our best to meet them through our products.

We are the Finest Lab Grown CVD Diamonds Manufacturer & Wholesaler in Surat.

New Grown Diamond Contact Office in Surat

Add:- 160, Laxmi Society, Behind Gajera School, Katargam, Surat, Gujarat 395004

One thought on “How CVD Diamond and Hpht Diamond Made?

  1. cbd says:

    Everything is very open with a precise clarification of the challenges.
    It was truly informative. Your website is useful.
    Thank you for sharing!

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