Diamante de laboratorio vs natural: comparativa real 2026

Lab-grown vs natural diamond: a real comparison 2026

For decades, mined diamonds were the only diamonds. Today, half of the engagement rings sold in the United States feature a lab-grown stone. In Spain, we are still at 18%, but the figure is growing by 38% year after year. Why are so many people making the switch? This comparison, with data, explains it.

Empecemos por lo obvio: son químicamente idénticos

A lab-grown diamond is not an imitation. It's not a cubic zirconia, it's not moissanite, it's not a "synthetic diamond" in the pejorative sense. It is carbon crystallized in the same cubic structure as a diamond mined from underground.

— Propiedad Diamante natural Diamante de laboratorio
Composición química Carbono puro (C) Carbono puro (C) = idéntico
Dureza (escala Mohs) 10 10 = idéntico
Índice de refracción 2,417 2,417 = idéntico
Densidad 3,52 g/cm³ 3,52 g/cm³ = idéntico
Dispersión (fuego) 0,044 0,044 = idéntico

"¿Pero pierden valor?"

This is the question that comes up in every conversation, so it deserves a direct answer.

The value of any diamond depends on the market, not its origin. Historically, natural diamonds were also not a good liquid investment — the difference between the retail price and the resale price was always 30–50%.

What is happening with lab-grown diamonds: as production has become industrialized, their retail price is falling year after year. This means that your diamond today may be worth less tomorrow on the secondary market.

But — and this is the point — you are not buying it as a financial asset either. You are buying it as jewelry. And if the math is "pay €5,800 for a natural ring" vs "pay €1,160 for the same lab-grown ring", the intelligent decision is not to wait for appreciation: it is to invest that €4,640 in something that will appreciate.

¿Cuándo elegir uno u otro?

Choose natural if:

  • You care about the sentimental value of its geological origin ("formed a billion years ago")
  • You will inherit the diamond or plan to pass it down to a generation that values it as a historical object
  • You have a generous budget and the price difference is not a factor

Choose lab-grown if:

  • You want more carats or better quality for the same money
  • You value traceability and a lower environmental impact
  • You are interested in the diamond as a piece of jewelry, not as a patrimonial investment

In 2026, for the vast majority of buyers, the rational answer is lab-grown. That's why the market is moving where it's moving.

Alfonso Martinez

Alfonso Martinez

Founding Partner

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