A Guide to Lab-Grown Diamonds: Production, Grading, and Shopping

A Guide to Lab-Grown Diamonds: Production, Grading, and Shopping

One of the most common questions we hear from clients is, “Are lab diamonds real?” The answer is a resounding yes. Lab-grown diamonds are real diamonds in every sense. They have the same physical and chemical properties as a diamond mined from the earth.

Lab-grown diamonds have enjoyed greater popularity in the past few years, thanks to their environmental and ethical impact. Kravit Jewelers walks you through the sublime beauty and mystery of a lab diamond and what makes it deserving of the spotlight as its natural sister.

Lab-Grown Diamonds vs. Natural Diamonds

Lab-grown diamonds, also known as man-made, cultured, or lab-diamonds, are created in a laboratory environment. It’s different from a natural or earth-mined diamond, which is formed over about a billion years.

Although they have different origins, a lab-grown diamond has the same chemical and physical properties as a natural diamond:

  • Chemical Composition.Both types of diamond are made of pure crystallized carbon (where each carbon atom is surrounded by four other carbon atoms, connected by covalent bonds)
  • Both are rated 10 on the Mohs Hardness Scale, making them the hardest substances on Earth.
  • Both have a density of 3.51g/cm3.
  • Refractive Index.Both have a refractive index of 2.42.
  • Fire or Light Dispersion.Both have a light dispersion of 0.044.
  • Both range from D (colorless) to Z (yellow). They also come in fancy colors.

In essence, lab diamonds are real diamonds. They’re not “fake gems.” They’re not moissanites, cubic zirconias, or imitation diamonds. You’re getting the real deal. Additionally, it’s inaccurate to call natural diamonds “real diamonds” because their lab-grown counterparts are true gems, too.

The only difference between a lab-grown and natural diamond is where they came from.

How Lab-Grown Diamonds Are Made

Before we discuss the production of lab-grown diamonds, we have to explore how earth-mined diamonds are formed.

Formation of Natural Diamonds

Natural diamonds are formed deep in the Earth’s mantle — about 100 miles beneath the surface. Carbon atoms in this region (which many believe are in the form of carbon dioxide) are subjected to extreme heat (upwards of 2,200°F) and pressure (around 727,000 pounds per square inch). A diamond gradually forms in this extreme environment over a period of 1 to 3.3 billion years.

These diamonds are then transported near the surface of the Earth through deep-sources volcanic eruptions. These eruptions tear through the mantle, delivering rocks known as xenoliths, containing the diamonds that people mine today.

This complex process explains the princely price tags of natural diamonds. They’re rare, and it takes a billion years to replace one.

As such, people resorted to technology to produce gem-quality lab-grown diamonds.

Production of Lab Diamonds

There are two main ways to produce lab diamonds.

High-Pressure High-Temperature

High-Pressure High-Temperature (HPHT) processes simulate the environment in which a diamond forms. The technicians place a diamond seed (a single crystal from a diamond about as thick as a human hair) into pure carbon and expose them to extreme temperature and pressure. The pure carbon then melts and forms a diamond around the diamond seed. It’s then cooled, and a lab diamond is formed.

Chemical Vapor Deposition

Chemical Vapor Deposition (CVD) also begins with a diamond seed placed in a chamber and exposed to high heat. Technicians then fill the chamber with a carbon-rich gas. The gases undergo ionization, which breaks the bonds between the carbon and other atoms. The pure carbon then adheres to the seed, forming a lab-grown diamond.

Compared to a billion-year-old natural diamond formation, lab-grown diamonds take less than a month to produce. Many laboratories can produce a 1-carat diamond in a little over a week.  


Why People Love Lab-Grown Diamonds

There’s so much to love about lab-grown diamonds.

Lower Price Tag

On average, lab-grown diamonds are more affordable than earth-mined diamonds. The latter has a longer supply chain; they are mined, distributed, and processed. In contrast, lab diamonds don’t involve a mining process.

That said, lab-grown diamonds are still relatively expensive. The costs of cutting, polishing, grading, and setting a diamond, earth-mined or lab-grown, are high.


Because lab-grown diamonds don’t involve mining, they have a significantly lower environmental impact than their natural counterparts.

Although gem-mining companies have improved their mining practices and reduced their environmental effects, lab-diamond production is still far less detrimental. It’s also important to note that it takes a lot less energy to grow a diamond than to mine one.

Ethical Provenance

Shoppers have the assurance that lab-grown diamonds are conflict-free and ethically produced. Because the diamonds are grown in a laboratory setting, consumers are confident that no miners or communities were exploited in the process.

A few decades ago, the diamond-mining industry came under heavy criticism for blood or conflict diamonds, which are mined in areas with armed conflict. These diamonds are often illegally traded to fund fighting. Because of the illicit supply chain, buyers couldn’t tell them apart from responsibly sourced diamonds.

To reduce the blood diamonds in the market, the Kimberley Process was established, and it has been largely successful. But if a consumer wants a guarantee that their jewelry is conflict-free, then a lab-grown diamond is the way to go.

What to Know When Shopping for a Lab-Grown Diamond

There are no differences in the grading systems of natural and lab-grown diamonds. As a shopper, you’ll inspect the 4Cs: cut, clarity, color, and carat.

  • Cut refers to the cut, shape, and geometry of the final diamond. The Gemological Institute of America (GIA) reports that cut is the most difficult to grade, often involving calculations and proportions.
  • Clarity refers to the absence of blemishes or inclusions in the diamonds. The GIA has a 6-point Clarity Scale ranging from Flawless to Included. The best lab diamonds are often graded Flawless, bearing no blemishes or inclusions under 10x magnification.
  • Color refers to a diamond’s colorlessness. The GIA uses a diamond color scale from D (colorless) to Z (light yellow or brown). Top-quality lab diamonds that have a colorless purity are graded D.

This scale, however, doesn’t include fancy color diamonds.  

  • Carat refers to the weight of the gem. One carat is one-fifth of a gram, and the carat weight dictates the size of the diamond.

Regardless of the grades of their 4Cs, lab-grown diamonds are one of the most beautiful pieces a person can have. It comes as no surprise that modern jewelry collections have an affinity for these man-made gems.

If you’re new to lab diamonds, start your collection with Kravit Jewelers. We have an extensive selection of these dazzling stones with different cuts, color grades, clarity grades, and carat weights.

Explore our lab diamonds today.