Man Made Diamond Earrings: A Jeweller's Honest Guide

Man made diamond earrings are set with real diamonds that were grown in a laboratory instead of mined. The stones are carbon, they are as hard as mined diamonds, and you cannot tell them apart by eye. Because earrings sit a long way from anyone's eye and come in a pair, they are one of the places where a lab-grown stone makes the most sense, provided the pair is matched properly and you know what the paperwork actually says.

What "man made" actually means

The phrase on the label matters less than what the stone is. According to GIA's guide to laboratory-grown diamonds, lab-grown stones "have the same crystal structure, consisting of tightly bonded carbon atoms," which gives them "nearly the same chemical, optical and physical properties as natural diamonds." That is a different thing from cubic zirconia or moissanite, which are separate materials that only look like diamond.

In a 2019 GIA article on telling natural and laboratory-grown diamonds apart, senior industry analyst Russell Shor wrote that identification "at a professional gemological laboratory or using sophisticated devices developed by GIA and other organizations are the only reliable methods to separate them from natural diamonds." Put plainly, neither you nor anyone admiring your earrings will spot the difference without lab equipment.

The words on the label

"Man made" is everyday language. It is not the wording sellers are expected to use. The US Federal Trade Commission's Jewelry Guides, in 16 CFR § 23.12, define a diamond as "a mineral consisting essentially of pure carbon crystallized in the isometric system." The Guides call it deceptive to use the unqualified word "diamond" for something that does not meet that definition. A laboratory-created stone can be called a diamond as long as a qualifier such as "laboratory-grown," "laboratory-created" or "[manufacturer name]-created" makes it clear the stone was not mined.

Those are US rules, but Canadian sellers follow the same logic in practice. If a listing says only "diamond earrings" with no qualifier, ask directly whether the stones are mined or grown. A straight answer should come quickly.

How lab-grown earring stones are graded now

This is the part that has changed recently, and it affects how you shop for a pair.

In a press release dated June 2, 2025, GIA announced that it would stop grading laboratory-grown diamonds on the D-to-Z colour scale and the clarity scale it built for natural stones. GIA now places them in one of two categories, "premium" or "standard," which it says are "defined by a combination of metrics related to color, clarity and finish." GIA's reason was that "more than 95% of laboratory-grown diamonds entering the market fall into a very narrow range of color and clarity." If a man-made diamond falls short of the minimum, GIA says "it will not receive a designation." GIA reports issued under the old system remain valid.

Other labs, IGI among them, still put familiar colour and clarity grades on lab-grown reports. So you may compare two pairs where one stone carries a GIA "standard" designation and the other carries an IGI "G VS1." These are different systems, and you cannot convert one into the other. Compare the stones themselves and the report details, not just the headline label.

GIA's statistic also tells you something practical. If nearly all lab-grown output falls in a narrow quality band, paying a large premium to move up a step within that band will rarely show in a stud. The /blog has separate guides on colour and clarity if you want the detail.

Matching a pair is the real skill

One diamond has to look good. Two diamonds also have to look like each other, and that is where earrings get harder than rings.

Here is what to check, in order of how much it shows:

• Diameter, not just weight. Two stones of the same carat weight can face up at different sizes if one is cut deeper. Compare the millimetre measurements on each report.
• Colour. A small difference between two stones sitting side by side is easier to see than the same difference in a single ring stone.
• Cut quality on rounds. If one stone sparkles noticeably more than the other, the pair will look uneven in daylight.
• Fluorescence. Strong fluorescence in one stone and none in the other can look different under some lighting. It is worth matching.
• Clarity. In a stud this matters least, as long as nothing is visible to the eye at normal distance.

Reading "total weight"

Earrings are usually sold by total carat weight, which is the combined weight of both stones. A "1 ct tw" pair is roughly two half-carat stones, not two one-carat stones. The FTC Guides on weight, at 16 CFR § 23.18, say that a weight given in decimals "should be accurate to the last decimal place," and that a fractional weight such as "1/2 ct" needs a conspicuous note that the figure is not exact. If a listing only gives a fraction, ask for the actual decimal weight of each stone.

Lab-grown or natural for earrings?

For most people buying studs, lab-grown is the sensible choice. I would say that more firmly about earrings than about an engagement ring, and these are the reasons:

1. Nobody inspects earrings up close. They sit to the side of the face, often under hair, and are seen from conversation distance.
2. Earrings get lost. A back works loose, one goes down a drain. Replacing one stone in a lower-cost pair hurts less.
3. Size shows more than grade. For the same budget, a lab-grown pair will usually get you larger stones, and that difference is visible.
4. Matching is easier. With so much lab-grown output in a narrow quality band, finding two stones that look alike is usually simpler.

Natural is worth choosing when the rarity matters to you personally, or when you want the stones to match a natural engagement ring and that matters to you. Resale is often given as a reason, but resale on any diamond jewellery is usually well below the purchase price, so I would not buy natural earrings as an investment.

Be wary of the green pitch

Lab-grown is often sold as the eco-friendly option. That claim needs proof. In a September 2024 submission to the Competition Bureau on the new greenwashing provisions in the Competition Act, the Canadian Jewellers Association pointed out that growing diamonds uses "large amounts of electricity" and that the source of that electricity is "a likely issue." The submission also noted that the FTC sent warning letters in 2019 to eight companies whose lab-grown advertising included unsubstantiated "eco-friendly" and "sustainability" claims. Choose lab-grown because it costs less and looks the same. Do not choose it because of a green label nobody has backed up.

Settings, backs and what to spend on

The setting decides how secure the earrings are and how big they look. Here is how the common stud styles compare:

The backs matter more than most people expect. Screw backs are the most secure for larger stones. Push backs are quicker to put on but loosen with wear. If the stones are big enough that losing one would really hurt, choose screw backs.

On metal, the usual trade-offs between white gold, yellow gold and platinum apply to earrings too, but earrings take far less knocking than a ring on your hand, so the durability case for platinum is weaker here. Our guide to ring metals covers the alloys if you are matching earrings to a ring.

Where the money is wasted

• Paying for D colour or flawless clarity in a stud. You will not see it from a metre away.
• A grade on a report that the other stone in the pair does not match. One very good stone next to an average one looks worse than two matched average stones.
• Large halos on small stones, if you would rather have a simpler pair with bigger centres for the same money.

What to do next

If you are buying man made diamond earrings, this is the order I would work in:

1. Set a budget for the pair, not for each stone.
2. Choose the total weight, then check each stone's millimetre diameter on its report.
3. Confirm the stones are clearly described as laboratory-grown and that each one has a report from a recognised lab.
4. Check the pair side by side for size, colour and sparkle before you look at clarity.
5. Choose screw backs if the stones are large or the earrings will be worn every day.

Reflections Craft is built around engagement rings, but the same thinking about stones applies. You can browse loose lab-grown and natural diamonds to see how report details and sizes compare, or start with our engagement ring settings if earrings are meant to match a ring.

Sources

• Gemological Institute of America (GIA), "Laboratory-Grown Diamonds," GIA 4Cs. 4cs.gia.edu/en-us/laboratory-grown-diamond
• Gemological Institute of America (GIA), "New Descriptive Terminology for Laboratory-Grown Diamonds," press release, June 2, 2025. gia.edu
• Russell Shor, Gemological Institute of America (GIA), "Difference Between Natural and Laboratory-Grown Diamonds," May 31, 2019. gia.edu
• US Federal Trade Commission, Guides for the Jewelry, Precious Metals, and Pewter Industries, 16 CFR § 23.12, "Definition and misuse of the word 'diamond'" (via Cornell Legal Information Institute). law.cornell.edu
• US Federal Trade Commission, Guides for the Jewelry, Precious Metals, and Pewter Industries, 16 CFR § 23.18, "Misrepresentation of weight and 'total weight'" (via Cornell Legal Information Institute). law.cornell.edu
• Canadian Jewellers Association, submission to the Competition Bureau, "Re: Public consultation on Competition Act's new greenwashing provisions," September 25, 2024. competition-bureau.canada.ca