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Lab-Grown Diamonds

Everything you need to know about lab-grown diamonds Everything you need to know about lab-grown diamonds

Who doesn’t love diamonds? They’re full of beauty and sparkle, and a special rarity that adds to their allure. It takes the exact right environment, and then millions (if not billions) of years for a diamond to form, which makes them a unique and special part of your jewelry collection.

Lab-grown loose diamonds

But while some say that rarity is what makes diamond rings and other diamond-based jewelry so special, there’s an alternative that’s been growing in popularity in recent years: lab-grown diamonds.

In this guide, we’ll explore the world of lab-made diamonds, including how they are made, the difference between lab-grown diamonds and diamond simulants, and how to decide if buying a lab-created diamond is the right choice for you.

What are Lab-Grown Diamonds?

Lab-grown diamonds are diamonds that are made in a controlled lab environment. They have the same chemical, physical, and optical properties as mined diamonds, with the only difference being their point of origin. Similar to their mined counterparts, lab-grown diamonds are evaluated with the 4 C’s: color, clarity, cut, and carat weight. Other terms to describe lab-grown diamonds include lab-created.

The 4 C's of Diamonds

COLOR

Diamond Color
Diamond Color

CLARITY

Diamond Clarity
Diamond Clarity

CUT

Diamond Cut

CARAT

Diamond Carat
Diamond Carat

Diamond Shapes

Diamond Shape
Diamond Shape

How are Lab-Grown Diamonds Made?

Sieve for Diamonds

Before we discuss how these diamonds are made, let’s step back and clarify how earth-mined diamonds are made to accurately compare the two.

There are three main components that go into creating a diamond: heat, pressure, and time. Diamonds begin growing underground, about 100 miles into the Earth’s mantle. Carbon molecules located there are under such intense heat and pressure that they bind together and create an extremely strong 3D pattern. But it has to be the exactly right environment for this to happen: mined diamonds require environments between 2102 degrees and 2192 degrees Fahrenheit and between 50 to 70 kilobars of pressure.

As for the time factor, the diamonds that we mine today have been growing for many, many years – in fact, the oldest diamond currently known to exist is a little over 3 billion years old! Through deep-source volcanic eruptions, these diamonds are brought closer to the surface where they can be found and mined.

Diamond Microscope

On the other hand, there are two main ways to create lab-grown diamonds. The first is through High Pressure/High Temperature (HP/HT), which mimics how diamonds are made in nature. This process begins with a diamond “seed,” which can be either a mined diamond or a lab-grown diamond. Hydraulic pressure and a proprietary recipe of iron, nickel, and cobalt flux create an environment that encourages the starter seed to grow.

The second way to create a lab-grown diamond is called Chemical Vapor Deposition, or CVD. Using the CVD process, a diamond starter seed is placed in a sealed chamber, which is heated to extreme temperatures. The chamber is then filled with a carbon-rich hydrogen and methane gas. This ionization breaks down the carbon gas, allowing the pure carbon molecules to adhere to the diamond seed. The carbon then slowly builds into a crystal layer by layer. CVD diamonds typically grow within 14 days.

How to Tell if a Diamond is Natural or Lab-Grown

Lab-Grown Diamond Solitaire

It’s nearly impossible for a consumer to tell the difference between natural and lab-created diamonds. In fact, even some jewelers can’t tell the difference without advanced testing.

The first is a Type IIa test, which identifies how pure the carbon is that makes up the diamond. There are four types of diamonds (Type Ia, Type Ib, Type IIa, or Type IIb), and Type IIa is the purest. Only 2% of mined diamonds are Type IIa, while almost all lab-grown diamonds are Type IIa. Therefore, if a diamond tests as Type IIa, there’s a pretty good chance that it’s a lab-grown diamond. This test isn’t entirely conclusive, because some mined diamonds are Type IIa and some lab-grown diamonds aren’t, but it gives jewelers and consumers a pretty good idea.

The second test is a radiation test done by gem labs with specialized equipment. In this test, suspected lab-grown diamonds are subjected to tests that measure and record specific patterns of light absorbance across the visible and ultraviolet regions of the spectrum of light. Both HP/HT and CVD diamonds show specific patterns. Fluorescent colors and patterns can also indicate the difference between mined and lab-grown diamonds.

Because lab-grown diamonds are virtually indistinguishable from mined diamonds, some buyers might be concerned that they will be sold a lab-grown diamond that is labeled as a natural diamond, but this is almost never the case. Lab-created diamonds are responsibly disclosed as such and some even feature laser inscriptions on the diamond’s girdle, the outermost edge, that label them as lab-grown. Most diamonds from reputable jewelers are evaluated by the Gemological Institute of America and other independent gemological laboratories, and include a report to confirm whether they are mined or lab-grown.

The Difference Between Lab-Grown Diamonds and Diamond Simulants

Three Loose Diamonds

Because diamond-growing technology is relatively new, there are still some uncertainties floating around about lab-grown diamonds.

Although they are created in a lab, these diamonds have all the same qualities as their mined counterparts and are just as real. This makes them very different from diamond simulants, like cubic zirconia or moissanite, which are stones designed to mimic the look of real diamonds but don’t possess the same physical, optical, and chemical qualities.

You may also come across treated diamonds, which are different from lab-grown diamonds and diamond simulants. This refers to mined or lab-grown diamonds that have been altered to improve their clarity and/or color. Technology like laser drilling and fracture filling can be used to reduce the visibility of inclusions and other clarity characteristics.

Choosing Between Lab-Grown and Mined Diamonds

There are a few factors to consider when deciding to buy a mined diamond or a lab-grown diamond. Both are beautiful choices, and it will come down to personal preference.

Lab-grown diamond

Some of the benefits of buying lab-made diamond jewelry include:

COST

Lab-produced diamonds are often more affordable than comparable mined diamonds. The cost difference will range depending on the size of the diamond and its characteristics, and can be a big factor if you’re watching your budget.

CHARACTERISTICS

As mentioned before, lab-grown diamonds have the same chemical, physical, and optical characteristics as mined diamonds, and are often available at a lower price point. Some jewelers can’t even tell them apart at first glance!

Is a Lab-Grown Diamond Right for You?

Engagement Rings Lifestyle

Because diamond-growing technology is relatively new, there are still some uncertainties floating around about lab-grown diamonds.

Buying the perfect diamond for an engagement ring or piece of jewelry for someone you love is a personal process. Some buyers might not mind that their diamond is lab-grown, while others put great value on the natural diamond mining process. Either way, you want to find a diamond you love through a jeweler you can trust.

Diamond-making technology has made significant advances in the last few decades and today, buyers can find lab-grown diamonds that rival their natural counterparts at a lower price point. When deciding whether you should buy an Earth-mined diamond or a lab-created diamond, consider your own needs and preferences and consult a reputable jeweler like REEDS for advice.

Ready to explore your options? Browse our full collection of lab-grown diamond rings, lab-grown diamond earrings, and more.

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