Are Lab-Grown Diamonds Real? The Honest 2026 Buyer's Guide

Yes — lab-grown diamonds are 100% real diamonds. They have the exact same chemical, physical, and optical properties as mined diamonds: pure crystallized carbon, a perfect 10 on the Mohs hardness scale, and the same fire and brilliance. The only difference is origin — one grows in a lab in weeks, the other formed underground over billions of years. A gemologist cannot tell them apart by eye; it takes specialized equipment. At Signora, every lab-grown diamond is IGI-certified, so you get that proof in writing.

Are lab-grown diamonds real or fake?

They are real. “Fake” diamonds are simulants like cubic zirconia or moissanite — different materials that only look similar. A lab-grown diamond is a diamond by every scientific definition. In 2018 the U.S. Federal Trade Commission officially removed the word “natural” from its definition of a diamond, confirming lab-grown stones are genuine diamonds and cannot be marketed as imitations.

How much do lab-grown diamonds cost vs. natural?

In 2026, a lab-grown diamond typically costs 80–95% less than a mined diamond of the same carat, cut, color, and clarity. That means you can choose a larger, higher-quality stone for the same budget — or the same look for a fraction of the price. It is the single biggest reason lab-grown now accounts for roughly one in five engagement rings sold, up from about 3% just five years ago. Explore our lab-grown diamond engagement rings to see the difference in person.

Are lab-grown diamonds durable enough for daily wear?

Absolutely. Because they share the identical crystal structure as mined diamonds, lab-grown diamonds score a perfect 10 on the Mohs hardness scale — the hardest known material on Earth. They resist scratching and chipping exactly the same way, which makes them ideal for engagement rings and everyday jewelry that has to last a lifetime.

Are lab-grown diamonds more ethical and sustainable?

For most buyers, yes. Lab-grown diamonds are guaranteed conflict-free with a fully traceable supply chain, and they require no open-pit mining — so there is no disturbed land or displaced ecosystems tied to your stone. If transparency about where your diamond comes from matters to you, a lab-grown diamond removes the uncertainty entirely.

Why IGI certification matters

Always buy a certified stone. The International Gemological Institute (IGI) has graded far more lab-grown diamonds than any other lab and has the most consistent standards for them, which is why it is the trusted benchmark for lab-grown. Every Signora diamond ships with its IGI report, so the 4Cs — cut, color, clarity, and carat — are independently verified, not just our word.

Do lab-grown diamonds hold their resale value?

Here is the honest answer most sellers avoid: no, lab-grown diamonds are not an investment. Because production keeps improving, prices fall each year, and resale typically returns only a fraction of retail. But the same is largely true of mined diamonds at resale. The real value of a lab-grown diamond is not resale — it is getting a bigger, cleaner, ethically sourced stone you will actually wear every day, for a price that made sense. Buy it for the meaning and the wear, not as an asset.

The bottom line

Lab-grown diamonds are real diamonds — same beauty, same durability, fully certified, and dramatically more affordable. For a modern couple who wants maximum sparkle, ethical sourcing, and honest pricing, they are an outstanding choice. Browse the full Signora collection, find a piece for a milestone in our anniversary gifts, or talk to our team about a fully custom design built around the exact stone you want.