Lab-Grown Diamond Myths: 10 Common Beliefs, Fact-Checked

Lab-grown diamond myths, and why they persist

Most lab-grown diamond myths come from confusing lab-grown stones with simulants or from marketing on either side of the industry. The facts are simpler: lab-grown diamonds are real diamond, they are as durable as mined ones, and their main differences are origin, price and resale. Below we fact-check ten common beliefs Indian buyers hear in showrooms and family conversations.

Myths persist partly because the category is new to many families and partly because there is a lot of money riding on how people perceive it. Natural diamond sellers have an interest in emphasising rarity, and lab-grown sellers have an interest in emphasising ethics and value. You deserve the plain facts.

Use this list as a quick reference before you shop or when a well-meaning relative raises a doubt.

A quick note before the list: myths are not lies so much as half-truths that spread because they are easy to repeat. Each one below has a grain of truth, which is why it sounds believable. We explain both the grain and the fuller picture so you can respond calmly when the topic comes up at a family function.

Myth 1 and 2: they are fake, and they look different

Myth: lab-grown diamonds are fake. Fact: they are crystallised carbon with diamond's structure and properties. Fakes, or simulants, are different materials such as cubic zirconia, moissanite or glass. Lab-grown stones are diamonds with a different origin.

Myth: you can tell by looking. Fact: lab-grown and mined diamonds of the same grade look identical to the eye and under a standard loupe. Laboratories need specialised instruments to determine origin.

What you may notice is that lab-grown stones in your budget are larger or higher in grade than natural options, simply because the price per carat is lower.

A related myth is that lab-grown diamonds are made from something other than carbon, such as glass or plastic. They are not. The carbon source is usually methane gas for CVD or graphite for HPHT, and the result is pure crystalline carbon, just as in a mined stone.

Shop lab-grown diamond jewellery →

Myth 3 and 4: they turn cloudy, and they are fragile

Myth: lab-grown diamonds turn cloudy or yellow over time. Fact: a diamond's colour and clarity do not change with normal wear. Cloudiness is usually oil and dirt on the surface, and cleaning restores sparkle. Disclosed post-growth colour treatment is generally considered stable.

Myth: they chip or scratch more easily. Fact: lab-grown diamonds have the same hardness and toughness as mined diamonds. Either can chip with a hard knock, particularly at thin edges or pointed tips, so protective settings and sensible care apply to both.

If someone shows you a scratched, cloudy stone sold as lab-grown, it may actually be a simulant or a heavily included low-grade stone.

Another version of this myth is that lab-grown diamonds lose their sparkle after a few years. Sparkle depends on cut and cleanliness, and neither changes with time if the stone is cared for. Old jewellery that looks dull usually needs a professional clean and a check of the setting, not a new stone.

Myth 5 and 6: they fail diamond testers, and are undetectable

Myth: lab-grown diamonds fail a diamond tester. Fact: they pass standard testers because they conduct heat like any diamond. Testers cannot tell lab-grown from natural.

Myth: lab-grown diamonds are completely undetectable. Fact: gemmological laboratories can identify origin using spectroscopy, fluorescence imaging and other techniques, and the industry widely screens parcels. Most certified lab-grown stones are also laser-inscribed as lab-grown.

Together these facts mean you cannot rely on a tester to confirm a natural diamond, but labs can, which is why independent certificates matter for natural purchases.

There is also a belief that lab-grown diamonds cannot be laser-inscribed or certified. In reality, independent labs certify them routinely, and many add a girdle inscription with the report number and the words lab-grown. You can read it with a 10x loupe once you know where to look.

Labs and traders take this seriously, so screening technology keeps improving every year.

Myth 7: they are always eco-friendly

Fact: lab-grown diamonds avoid mining impacts, but growth is energy-intensive. Their footprint depends on the power source. Stones grown on renewable energy may have a low footprint, while those on fossil-fuel power may not.

Vague green labels without evidence are a marketing claim, not a fact. Ask sellers for specifics such as energy sources or third-party certification.

The opposite myth, that lab-grown is always worse than mining, is equally unfounded. Impacts vary by producer on both sides.

It is fair to say that a producer using renewable power can make a genuinely lower-impact stone. The myth is not that lab-grown can be greener; it is that it always is, regardless of how it was made. Specifics separate the two.

Myth 8: they are a good investment

Fact: lab-grown diamond prices have declined as production has expanded, and resale value is typically low. Exchange or upgrade schemes vary by seller and are often limited.

That does not make lab-grown a bad purchase; it makes it a consumption purchase. You pay less for beauty now and accept low resale later. The gold or platinum setting retains metal value.

If you want investment-like jewellery, gold remains the traditional Indian choice, with natural diamonds second for those who value rarity and established exchange routes.

One more investment-related myth is that lab-grown diamonds will one day become as valuable as natural ones as they become accepted. Acceptance is growing, but value depends on scarcity and resale demand, and lab-grown supply is not scarce. Enjoy them for beauty and accept modest resale.

Browse fine jewellery →

Myth 9 and 10: all are flawless, and certificates guarantee beauty

Myth: every lab-grown diamond is flawless. Fact: lab-grown diamonds can have inclusions, graining, metallic flux or tints, and they are graded on the same scales. Flawless and internally flawless stones exist but are not the norm.

Myth: a certificate guarantees a beautiful stone. Fact: a certificate confirms identity and grades, not attractiveness. Two stones with identical grades can look different due to cut details, tint or fluorescence. Use the certificate with videos or in-person viewing.

Also note that grading standards vary somewhat between laboratories, so compare stones graded by the same lab when possible.

A further myth is that lab-grown diamonds are all the same, so the cheapest one is the best buy. Cut quality, proportions, polish and symmetry vary a lot between stones of the same carat and colour. Paying a little more for an excellent cut often makes a visible difference in sparkle.

Bonus myth: only young couples buy lab-grown

Lab-grown diamonds are popular with younger buyers in Indian metros, but they are not limited to them. Many women buy lab-grown studs or pendants for themselves for office wear, parents gift lab-grown pieces to children for milestones, and some families choose lab-grown for secondary wedding functions while reserving gold and natural diamonds for the main ceremony.

Age has little to do with it. What matters is whether you value size, sparkle and price over rarity and resale. Buyers of every age group make that trade-off in different ways for different pieces.

The growing range of designs, from minimal solitaires to elaborate necklaces and mangalsutra pendants, means there is something for most tastes and occasions.

Finally, take time to view stones in different lighting. Showroom spotlights flatter every diamond, while daylight and home lighting are more honest. A stone that still looks lively near a window is a good sign that the cut is doing its job.

If a doubt still lingers, ask your jeweller to show you a lab-grown and a natural stone side by side. Seeing them together usually settles most myths in a minute, far faster than any argument.

How to shop beyond the myths

Focus on cut quality first, then a colour and clarity combination that looks clean and white to your eye. Insist on an independent report and an invoice stating lab-grown diamond.

Check the metal hallmark, compare making charges and read exchange policies in writing. Clean and care for your jewellery as you would any diamond.

Armed with facts, you can enjoy lab-grown diamonds for what they are: real, durable, beautiful and far more accessible than they used to be.

Explore lab-grown diamond jewellery →