Are lab-grown diamonds real diamonds?

Yes. A lab-grown diamond is the same crystal of carbon as a mined one, with the same hardness, the same refractive index and the same sparkle. Only specialist equipment can tell them apart, and they cost a fraction of the price.

This is a question with an unusually clean answer, because it is a question about material science rather than taste.

They are chemically identical. A lab-grown diamond is carbon in the same crystal structure as a mined diamond. It is 10 on the Mohs scale, exactly as hard. It has the same refractive index, so it bends light the same way and sparkles the same way under the same lights. It is graded on the same scale for cut, color and clarity.

What is different. The price, by a large multiple, and the origin. A gemmologist with the right equipment can identify growth patterns that differ from natural formation, and reputable stones are laser-inscribed. Nobody can tell by looking, including across a dinner table.

What this means for buying. At the point of looking, price has stopped being a signal. So spend your judgment on the setting instead, which is the part that actually fails: bezel and channel settings protect the stone and survive daily wear, while exposed prongs snag on clothing and loosen over time.

On resale, be realistic: lab-grown stones have very little resale value, because supply is not constrained. If you are buying to wear, that is irrelevant. If you are buying as a store of value, it is the whole point.

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