Lab-grown diamond or natural diamond? What you need to know by 2026

As we move into 2026, many buyers face the same question: "Should I choose a lab-grown diamond or a natural diamond?" One thing is certain: both are real diamonds. However, they differ in terms of price, value appreciation, and sustainability.

1. What is a lab-grown diamond (LGD)?

LGD diamonds are produced under controlled conditions by mimicking the natural formation process (HPHT or CVD). Optically, chemically, and physically, they are identical to mined diamonds.

• Advantages: 50–70% cheaper, environmentally friendly and ethically sound. Larger carat sizes become affordable for every budget.
• Disadvantages: Lower potential for value appreciation compared to rare natural stones.

2. What is a natural diamond?

A natural diamond forms over millions of years deep in the Earth's mantle. It is a geological wonder and a unique creation of nature.

• Advantages: High resale value, prestigious and ideal as an heirloom or investment.
• Disadvantages: Significantly higher purchase price and environmental impacts due to mining.

3. Trend forecasts for 2026

Sustainability is becoming the number one purchasing criterion. Young buyers in Europe, in particular, prefer ethically produced stones. Furthermore, we are observing that by 2026, carat sizes between 1.50 and 2.50 ct will become the standard for lab-grown diamonds in engagement rings.

4. The direct comparison

Our conclusion: What suits you?

If you're looking for a large carat size at the best price, a lab-grown diamond is the right choice. However, if you're seeking a long-term investment and value tradition, a natural diamond remains unbeatable. At Sirius Diamond, we offer certified stones (GIA, IGI) in both categories.