HPHT Vs CVD Diamonds

Whether you are looking to buy a diamond ring for your significant other or you simply want to buy a diamond as a gift for your family, you should know the differences between hpht vs cvd diamonds. By knowing the difference between these two types of diamonds, you can make the right decision and ensure that you get a high quality diamond for your loved one.

HPHT diamonds have a blue nuance

During the process of creating a lab-grown diamond, the grower may sometimes expose the diamond to boron. This is done in order to remove excess nitrogen from the growing chamber.

While boron is not the only reason a diamond may have a blue tint, it’s an important consideration to make. This is because of the way it speeds up the growth process.

While the blue tint on a lab-grown diamond is not an exact match for the hue of a natural diamond, it’s still noticeable. And, while some dealers are agnostic about whether or not their diamonds were treated in a lab, others will actively avoid HPHT synthesis stones.

A CVD diamond, on the other hand, tends to be more brown in color. This is because of the vacancies present in the crystal structure. Some CVD stones may also have a post-growth treatment that boosts their color.

CVD diamonds are chemically pure

Compared with the traditional diamond making processes, the Chemical Vapour Deposition (CVD) process uses less energy and is considered less expensive. It is also considered to be the best way to create colourless diamonds. The main advantage of the CVD process is that there is no need for high pressures.

In CVD, a diamond seed is deposited onto a substrate. The substrate is then polished. The substrates used for CVD diamonds are typically 3.5 x 3.5 x 1.6 mm3 commercial HPHT synthetic type Ib diamonds.

These substrates are mounted on a molybdenum substrate holder. The substrates required smooth, polished surfaces.

CVD diamonds are grown by atomizing a mixture of carbon and hydrogen. This process is similar to the diamond formation process in interstellar gas clouds.

CVD diamonds have a hazy, milky, or oily appearance

Usually, when a diamond has a hazy, milky, or oily look, it is produced by the Chemical Vapor Deposition (CVD) method. This process produces diamonds that are very similar to those that are mined naturally. CVD diamonds generally have a brownish or grey color.

Unlike lab-grown diamonds, the colour grade of a cvd vs hpht diamond is not affected by its fluorescence. However, the fluorescence effect is diminished with increasing distance from the light source.

When the diamond is first purchased, the effect of fluorescence may not be noticeable. However, over time, the effect becomes more apparent.

The GIA describes five levels of diamond fluorescence. The strongest one has a measurable effect on the appearance of a diamond.

The hazy, milky, or oily effect of a diamond is often attributed to the presence of inclusions. An inclusion is a crystal or mineral that is present within the diamond. Inclusions can be colorless, green, red, or black.

CVD diamonds are cheaper

Whether you’re looking for a diamond for your engagement ring, your wedding band, or even a fancy colored gemstone, you may want to look into purchasing a CVD diamond. These diamonds are a lot cheaper than their natural counterparts.

CVD Diamonds are created using a scientific process called Chemical Vapor Deposition (CVD). Scientists use gases to form diamonds, which are then treated with a high temperature to make them hard.

CVD Diamonds are available in many colors and shapes. They have the same properties as mined diamonds, including hardness, sparkle, and a range of other qualities. The process is also relatively inexpensive.

CVD Diamonds are also more environmentally friendly than their natural counterparts. For one, they are grown in a controlled environment, which reduces their carbon footprint.

CVD diamonds are better if both diamonds are as-grown

Unlike natural diamonds, CVD diamonds are created using a chemical vapor deposition (CVD) process. This process mimics the process of diamond formation in interstellar gas clouds. It is also a less energy intensive process, which means that the diamonds produced are cheaper.

The process also produces chemically pure Type IIA diamonds. These diamonds are extremely rare in nature. Moreover, this process uses less extreme temperatures.


CVD diamonds are ethically sourced, and they are environmentally friendly. They are not subject to mining or habitat destruction. They are also more competitively priced, making them a good choice for socially conscious buyers.

During growth, CVD diamonds usually exhibit a grey or brown colour. This is due to several features in the absorption spectrum. If a CVD diamond is cut skillfully, it will show the same scintillation and fire as a natural diamond.

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