Lab-Grown vs. Natural Diamonds: A Gemologist’s Honest Comparison

Lab-grown and natural diamonds are chemically and optically identical — both are real diamonds, and the eye can’t tell them apart. The differences are origin, price and resale value: lab-grown diamonds cost roughly 60 to 85 percent less upfront but hold little resale value, while natural diamonds cost more and retain value far better. Neither is simply “better” — the right choice depends on what you care about most.

Are Lab-Grown Diamonds Real Diamonds?

Yes. A lab-grown diamond has the same carbon crystal structure, hardness, brilliance and fire as a mined one. They are not “fake” or simulants like cubic zirconia or moissanite — they are diamond, simply grown in a few weeks in a reactor instead of forming over billions of years in the earth. Even a gemologist can’t distinguish them by eye; it takes specialized equipment to detect the subtle differences in how they grew.

How They’re Made

Natural diamonds form deep in the earth under heat and pressure over billions of years, then are mined. Lab-grown diamonds are created two ways: HPHT (high pressure, high temperature), which mimics the earth’s conditions, and CVD (chemical vapour deposition), which grows diamond layer by layer from carbon-rich gas. Both produce genuine diamond crystals that are then cut and polished exactly like natural stones.

Price: The Biggest Difference

This is where the gap is dramatic. A lab-grown diamond typically costs 60 to 85 percent less than a comparable natural diamond, which means you can buy a noticeably larger or higher-quality stone for the same budget. Lab-grown prices have also been falling steadily as production scales up — great for buyers today, but it’s exactly why resale value is weak.

Resale and Long-Term Value

Natural diamonds hold their value far better. There’s an established resale and estate market for them, and their supply is finite. Lab-grown diamonds, by contrast, have very little resale value: because they can be manufactured in unlimited quantities and prices keep dropping, a lab-grown stone bought today may be worth a fraction of its price later. If you think of a diamond as an heirloom or an asset, natural has the edge. If you think of it as a beautiful purchase for today, lab-grown’s value is hard to beat.

The Environmental and Ethical Picture

It’s more nuanced than the marketing on either side suggests. Lab-grown diamonds avoid mining, but growing them is energy-intensive, and the real footprint depends heavily on how that energy is produced. Natural diamonds carry mining impacts, but the modern trade is regulated and supports many communities. Both have credible ethical paths and genuine trade-offs — be wary of absolute claims in either direction, and ask where a specific stone actually came from.

How to Tell Them Apart

You can’t, by eye — and neither can your jeweller without equipment. The reliable way to know what you have is the grading report: reputable lab-grown diamonds are certified by labs such as IGI or GIA and explicitly state “laboratory-grown,” and many are laser-inscribed on the girdle. Always insist on a grading report whichever you buy, and have any significant diamond verified by an independent gemologist.

So Which Should You Choose?

There’s no universally right answer; it depends on your priorities. Choose lab-grown if you want the largest, brightest stone for your budget and resale doesn’t matter to you. Choose natural if you value rarity, long-term value and the idea of owning something billions of years in the making. What matters most either way is buying a well-cut, well-certified stone from someone who’ll tell you the honest trade-offs — cut quality affects a diamond’s beauty far more than its origin does.

Compare Both With a Gemologist in London, Ontario

At Daniel A Jewellery you can compare lab-grown and natural diamonds and get straight, unbiased guidance from a GIA Graduate Gemologist — including custom designs built around either. Book a free, no-obligation consultation. Daniel A Jewellery, 467 Wharncliffe Road South, Unit 3, London, ON N6J 2M9. Phone: (519) 660-8383.