CVD Diamonds: Everything you need to know

Diamonds grown in laboratories are created by two methods: high pressure high temperature (HPHT) and chemical vapour deposition (CVD). What are these two methods?

HPHT: This method replicates the process through which diamonds get formed beneath the earth, over thousands of years. Pressures of 5-6 GPa and temperatures of 1400-1600 °C form HPHT diamonds.
CVD: This method involves diamond seeds going through chemical processes under low pressure, leading to the creation of CVD diamonds.

A brief history of CVD diamonds

When lab-grown diamonds were first discovered in 1956, the HPHT method was used to produce them. Since then, scientists and innovators have been trying to find new ways to create diamonds. It was only in the 1980s that the CVD process for creating diamonds was fully established and realized. Some of the names of the first creators of CVD diamonds are: W.G. Eversole, Derjaguin, and J. C. Angus.

According to an article by Robert Linares, Integrated Diamond Technologies, LLC, on the GIA (Gemological Institute of America) website, “the earliest CVD growth chambers enabled growth on only one seed at a time. Although reactor seed capacity is a closely guarded industrial secret, some CVD manufacturing systems are reportedly capable of growing 50 or more seeds simultaneously. That number is expected to increase.”

Improved CVD technique: Another report by the GIA reveals that CVD technology has enhanced over the years, and innovators are rapidly improving techniques to produce large, high-quality, near-colourless diamonds. In 2016, a 3-carat, the largest CVD synthetic diamond, was tested by GIA, after which a 5-carat diamond was tested.” The ability to minimize, control, and manipulate defects in CVD diamonds has grown rapidly over the last 20 years.

Properties of a CVD diamond

CVD diamond's most significant characteristics are its

Unparalleled hardness
Extraordinary thermal conductivity.
Very chemically inert: unaffected by acids or other chemicals.
Broad-band optical transparency.
Graphitization is limited to very high temperatures.

What is the CVD diamond Making Process?

The CVD process of producing diamonds, like the name suggests, includes chemicals – a mixture of hydrocarbon gas and hydrogen. This mixture is introduced into the diamond’s growing temperature at low pressure. Here, some of the hydrogen gets converted to atomic hydrogen, which aids in the formation of the CVD diamond. With the help of heat, atomic hydrogen reacts with the hydrocarbon gas to form pure carbon, which is the CVD diamond.

How fast do CVD diamonds grow?

CVD diamonds grow on average between 0.1 and 10 micrometers per hour. Some of the factors that can alter the exact growth rate are the configuration of the CVD equipment, the gas mixture being used, the temperature, and the pressure conditions. These growth rates may be impacted by and even accelerated by technological advancements in CVD diamond production.

The advantages of CVD over HPHT

The CVD process has a number of advantages over the HPHT process for producing diamonds. Here are some:

Higher flexibility of CVD diamond size and shape.
The addition of gases in this process can reduce impurities in CVD diamonds.
The ability to grow diamonds over large areas and on various substrates.
Better control over the chemical impurities and thus the properties of the CVD diamond.
The CVD process does not require high pressures, as the growth typically occurs at pressures under 27 kPa.

Cutting and polishing of CVD Diamonds

CVD diamonds are cut and polished in the same manner as mined diamonds and at the same cost. The diamonds can be laser inscribed on the girdle so that buyers can identify them as lab-grown diamonds.

Why should you buy CVD diamonds?

CVD Diamond Price: They are less expensive than mined diamonds. They are as real as the mined diamonds are.
Conflict-Free Diamonds: CVD diamonds are conflict-free. Socially and politically conscious buyers must buy only these lab-grown diamonds.
Eco-Friendly Diamonds: CVD diamonds are environmentally safe as they are produced in a safe laboratory environment.
Type IIA Diamonds: CVD diamonds, colourless or near colorless (D-J), are classified as Type IIA, the purest form of diamonds.

Whether it’s HPHT or CVD, buyers are now leaning towards buying lab-created carbon diamonds as opposed to mined diamonds. Lab-created diamonds give buyers the possibility of creating their own unique diamond. From size, shape, cutting, polishing, and designing your piece of jewelry, you can do it all with HPHT or CVD-created lab-grown diamonds. Who would have thought this would be possible? And because it is possible, why go for the super-expensive, conflict-mined diamonds?

{"AutoID":10,"DateCreation":"\/Date(1605034385110)\/","DateModified":"\/Date(1731323151340)\/","CreatedBy":null,"ModifiedBy":"Rahul Bohra ","RecordStatus":"A","Title":"CVD Diamonds: Everything you need to know","SubTitle":"Diamonds grown in laboratories are created by two methods: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD). What are these two methods?...","Description":"\u003cp\u003eDiamonds grown in laboratories are created by two methods: high pressure high temperature (HPHT) and chemical vapour deposition (CVD). What are these two methods?\u003c/p\u003e\r\n\r\n\u003cul\u003e\r\n\t\u003cli dir=\"ltr\"\u003e\r\n\t\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eHPHT\u003c/strong\u003e:\u0026nbsp;This method replicates the process through which diamonds get formed beneath the earth, over thousands of years. Pressures of 5-6 GPa and temperatures of 1400-1600 \u0026deg;C form HPHT diamonds.\u003c/p\u003e\r\n\t\u003c/li\u003e\r\n\t\u003cli\u003e\u003cstrong\u003eCVD\u003c/strong\u003e:\u0026nbsp;This method involves diamond seeds going through chemical processes under low pressure, leading to the creation of CVD diamonds.\u003c/li\u003e\r\n\u003c/ul\u003e\r\n\r\n\u003ch2\u003e\u003cstrong\u003eA brief history of CVD diamonds\u003c/strong\u003e\u003c/h2\u003e\r\n\r\n\u003cp dir=\"ltr\"\u003eWhen\u0026nbsp;\u003ca href=\"https://www.growndiamondcorp.com/blog/types-of-lab-grown-diamonds/\"\u003elab-grown diamonds\u0026nbsp;\u003c/a\u003ewere first discovered in 1956, the \u003ca href=\"https://www.growndiamondcorp.com/blog/hpht-lab-grown-diamonds-history-process-and-benefits/\"\u003eHPHT method\u003c/a\u003e was used to produce them.\u0026nbsp; Since then, scientists and innovators have been trying to find new ways to create diamonds. It was only in the 1980s that the CVD process for creating diamonds was fully established and realized. Some of the names of the\u0026nbsp;\u003cstrong\u003efirst creators of\u0026nbsp;CVD diamonds\u0026nbsp;are: W.G. Eversole, Derjaguin, and J. C. Angus.\u003c/strong\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003e\u0026nbsp;\u003c/p\u003e\r\n\r\n\u003cp dir=\"ltr\"\u003eAccording to an article by Robert Linares, Integrated Diamond Technologies, LLC, on the GIA (Gemological Institute of America) website, \u0026ldquo;the earliest CVD growth chambers enabled growth on only one seed at a time. Although reactor seed capacity is a closely guarded industrial secret, some CVD manufacturing systems are reportedly capable of growing 50 or more seeds simultaneously. That number is expected to increase.\u0026rdquo;\u003c/p\u003e\r\n\r\n\u003cp dir=\"ltr\"\u003e\u0026nbsp;\u003c/p\u003e\r\n\r\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eImproved CVD technique\u003c/strong\u003e: Another report by the GIA reveals that CVD technology has enhanced over the years, and innovators are rapidly improving techniques to produce large, high-quality, near-colourless diamonds. In 2016, a 3-carat, the largest CVD\u0026nbsp;\u003ca href=\"https://www.growndiamondcorp.com/blog/why-real-synthetic-diamonds-are-cost-effective/\"\u003esynthetic diamond\u003c/a\u003e,\u0026nbsp;was tested by GIA, after which a 5-carat diamond was tested.\u0026rdquo; The ability to minimize, control, and manipulate defects in CVD diamonds has grown rapidly over the last 20 years.\u003c/p\u003e\r\n\r\n\u003cp dir=\"ltr\"\u003e\u0026nbsp;\u003c/p\u003e\r\n\r\n\u003ch2 dir=\"ltr\"\u003e\u003cstrong\u003eProperties of a CVD diamond\u003c/strong\u003e\u003c/h2\u003e\r\n\r\n\u003cp dir=\"ltr\"\u003eCVD diamond\u0026#39;s most significant characteristics are its\u003c/p\u003e\r\n\r\n\u003cul\u003e\r\n\t\u003cli dir=\"ltr\"\u003e\r\n\t\u003cp dir=\"ltr\"\u003eUnparalleled hardness\u003c/p\u003e\r\n\t\u003c/li\u003e\r\n\t\u003cli dir=\"ltr\"\u003e\r\n\t\u003cp dir=\"ltr\"\u003eExtraordinary thermal conductivity.\u003cbr /\u003e\r\n\tVery chemically inert: unaffected by acids or other chemicals.\u003c/p\u003e\r\n\t\u003c/li\u003e\r\n\t\u003cli dir=\"ltr\"\u003e\r\n\t\u003cp dir=\"ltr\"\u003eBroad-band optical transparency.\u003c/p\u003e\r\n\t\u003c/li\u003e\r\n\t\u003cli dir=\"ltr\"\u003e\r\n\t\u003cp dir=\"ltr\"\u003eGraphitization is limited to very high temperatures.\u003c/p\u003e\r\n\t\u003c/li\u003e\r\n\u003c/ul\u003e\r\n\r\n\u003cp dir=\"ltr\"\u003e\u0026nbsp;\u003c/p\u003e\r\n\r\n\u003ch2\u003e\u003cstrong\u003eWhat is the CVD diamond Making Process?\u003c/strong\u003e\u003c/h2\u003e\r\n\r\n\u003cp\u003eThe\u0026nbsp;CVD process of producing diamonds,\u0026nbsp;like the name suggests, includes chemicals \u0026ndash; a mixture of hydrocarbon gas and hydrogen. This mixture is introduced into the diamond\u0026rsquo;s growing temperature at low pressure. Here, some of the hydrogen gets converted to atomic hydrogen, which aids in the formation of the CVD diamond. With the help of heat, atomic hydrogen reacts with the hydrocarbon gas to form pure carbon, which is the CVD diamond.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u0026nbsp;\u003c/p\u003e\r\n\r\n\u003ch2\u003e\u003cstrong\u003eHow fast do CVD diamonds grow?\u003c/strong\u003e\u003c/h2\u003e\r\n\r\n\u003cp\u003eCVD diamonds grow on average between 0.1 and 10 micrometers per hour. Some of the factors that can alter the exact growth rate are the configuration of the CVD equipment, the gas mixture being used, the temperature, and the pressure conditions. These growth rates may be impacted by and even accelerated by technological advancements in CVD diamond production.\u003c/p\u003e\r\n\r\n\u003ch3\u003eThe advantages of CVD over HPHT\u003c/h3\u003e\r\n\r\n\u003cp\u003eThe CVD process has a number of advantages over the HPHT process for producing diamonds. Here are some:\u003c/p\u003e\r\n\r\n\u003cul\u003e\r\n\t\u003cli dir=\"ltr\"\u003e\r\n\t\u003cp dir=\"ltr\"\u003eHigher flexibility of CVD diamond size and shape.\u003c/p\u003e\r\n\t\u003c/li\u003e\r\n\t\u003cli dir=\"ltr\"\u003e\r\n\t\u003cp dir=\"ltr\"\u003eThe addition of gases in this process can reduce impurities in CVD diamonds.\u003c/p\u003e\r\n\t\u003c/li\u003e\r\n\t\u003cli dir=\"ltr\"\u003e\r\n\t\u003cp dir=\"ltr\"\u003eThe ability to grow diamonds over large areas and on various substrates.\u003c/p\u003e\r\n\t\u003c/li\u003e\r\n\t\u003cli dir=\"ltr\"\u003e\r\n\t\u003cp dir=\"ltr\"\u003eBetter control over the chemical impurities and thus the properties of the CVD diamond.\u003c/p\u003e\r\n\t\u003c/li\u003e\r\n\t\u003cli\u003eThe CVD process does not require high pressures, as the growth typically occurs at pressures under 27 kPa.\u003c/li\u003e\r\n\u003c/ul\u003e\r\n\r\n\u003ch2\u003e\u003cstrong\u003eCutting and polishing of CVD Diamonds\u003c/strong\u003e\u003c/h2\u003e\r\n\r\n\u003cp\u003e\u003ca href=\"https://www.growndiamondcorp.com/blog/cvd-diamonds-are-the-new-trend-and-heres-why-you-should-get-them/\"\u003eCVD diamonds\u003c/a\u003e are cut and polished in the same manner as\u0026nbsp;\u003ca href=\"https://www.growndiamondcorp.com/blog/can-you-easily-distinguish-between-a-mined-and-a-lab-grown-diamond/\"\u003emined diamonds\u0026nbsp;\u003c/a\u003eand at the same cost. The diamonds can be laser inscribed on the girdle so that buyers can identify them as\u0026nbsp;lab-grown diamonds.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u0026nbsp;\u003c/p\u003e\r\n\r\n\u003ch2\u003e\u003cstrong\u003eWhy should you buy CVD diamonds?\u003c/strong\u003e\u003c/h2\u003e\r\n\r\n\u003cul\u003e\r\n\t\u003cli dir=\"ltr\"\u003e\r\n\t\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eCVD Diamond\u0026nbsp;Price\u003c/strong\u003e:\u0026nbsp;They are less expensive than mined diamonds. They are as real as the mined diamonds are.\u003c/p\u003e\r\n\t\u003c/li\u003e\r\n\t\u003cli dir=\"ltr\"\u003e\r\n\t\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eConflict-Free Diamonds\u003c/strong\u003e:\u0026nbsp;CVD diamonds are\u0026nbsp;\u003ca href=\"https://www.growndiamondcorp.com/blog/why-are-man-made-diamonds-called-conflict-free-diamonds/\"\u003econflict-free\u003c/a\u003e. Socially and politically conscious buyers must buy only these lab-grown diamonds.\u003c/p\u003e\r\n\t\u003c/li\u003e\r\n\t\u003cli dir=\"ltr\"\u003e\r\n\t\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eEco-Friendly Diamonds\u003c/strong\u003e:\u0026nbsp;CVD diamonds are environmentally safe as they are produced in a safe laboratory environment.\u003c/p\u003e\r\n\t\u003c/li\u003e\r\n\t\u003cli\u003e\u003cstrong\u003eType IIA Diamonds\u003c/strong\u003e:\u0026nbsp;CVD diamonds, colourless or near colorless (D-J), are classified as\u0026nbsp;\u003ca href=\"https://www.growndiamondcorp.com/blog/what-is-a-type-iia-lab-grown-diamond/\"\u003eType IIA,\u003c/a\u003e\u0026nbsp;the purest form of diamonds.\u003c/li\u003e\r\n\u003c/ul\u003e\r\n\r\n\u003cp\u003e\u0026nbsp;\u003c/p\u003e\r\n\r\n\u003cp\u003eWhether it\u0026rsquo;s\u0026nbsp;HPHT or CVD, buyers are now leaning towards buying\u0026nbsp;\u003cstrong\u003elab-created carbon diamonds\u003c/strong\u003e\u0026nbsp;as opposed to mined diamonds.\u0026nbsp;\u003ca href=\"https://www.growndiamondcorp.com/blog/7-lies-and-myths-about-lab-grown-diamonds-you-must-know/\"\u003eLab-created diamonds\u0026nbsp;\u003c/a\u003egive buyers the possibility of creating their own unique diamond. From size, shape, cutting, polishing, and designing your piece of jewelry, you can do it all with\u0026nbsp; HPHT or CVD-created lab-grown diamonds. Who would have thought this would be possible? And because it is possible, why go for the super-expensive, conflict-mined diamonds?\u003c/p\u003e\r\n","FromDate":null,"ToDate":null,"Image_Url":"cvd-diamonds-everything-you-need-to-know.jpg","Image_Alt":"CVD Diamonds","KeyWords":"cvd diamond manufacturing process, cvd diamond process, cvd diamond, buy cvd diamonds, cvd diamonds price, cvd process, cvd diamonds for sale, cvd diamond manufacturers, cvd diamond suppliers, grown diamond corporation, synthetic diamond, lab grown diamonds, cvd diamond, lab diamonds","MetaDescription":"Should you invest in CVD diamond terms of investment? CVD diamonds are human-made diamonds, but are identical to natural diamonds and are 100% authentic diamonds. 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