Lab-Grown vs. Natural Diamonds: Same Sparkle, Different Story

A lab-grown diamond is a real diamond. Same carbon lattice, same 10 on the Mohs scale, same fire. The difference is origin — and origin, it turns out, is worth a lot of money.

Identical where it counts

Optically and chemically, a quality lab-grown stone is indistinguishable from a natural one to the naked eye. No fog test, sparkle check or thermal pen can tell them apart, because there's nothing physically inferior to detect. Anyone who claims to spot the difference by eye is guessing.

Where they diverge

• Price: Lab-grown typically costs 60–85% less than a comparable natural stone today, and that gap has been widening as production scales.
• Resale: Natural diamonds hold value far better. Lab-grown resale is weak and still settling — buy lab-grown to wear, not to invest.
• Origin story: Naturals are billions of years old and finite; lab-grown are made in weeks with a smaller land footprint. Which matters more is personal.

How labs actually tell them apart

You can't do this at home. It takes instruments:

• Photoluminescence spectroscopy reveals growth-pattern signatures unique to CVD/HPHT lab processes.
• UV fluorescence often differs — many lab-grown stones show distinctive patterns under shortwave UV.
• Strain patterns under cross-polarised light differ between earth-formed and lab-formed crystals.

The takeaway

Neither is "fake." But because the value gap is enormous, knowing which one you hold is essential — for insurance, for resale, and simply for paying the right price. That natural-vs-lab-grown call is the headline result on every Diamonds Tester lab certificate.