Laboratories Diamonds vs. Natural Diamonds 2026: Buyer's Guide to Choosing an Engagement Ring
Same Diamond, Half the Price – Or Is It the Same?
A concrete example speaks louder than words: a 1-carat lab-grown diamond ring (G color, VS2 clarity, Excellent cut) cost around 580 € in June 2025, while a comparable natural diamond cost about 2,630 €. The price difference is a staggering 78%.
But is a cheaper diamond somehow inferior? No. Lab-grown diamonds are chemically, physically, and optically identical to natural diamonds. Both consist of pure carbon (C), and both have a hardness of 10 on the Mohs scale. The only difference is their origin: one is formed deep within the earth over millions of years, while the other is grown in a laboratory in a matter of weeks.
In this guide, we walk through prices, certificates, environmental impacts, and resale value – everything a Finnish buyer needs when choosing an engagement ring in 2026.
What Lab-Grown Diamonds Really Are – And What They Are Not
Lab-grown diamonds are produced using two primary methods. HPHT (High Pressure, High Temperature) mimics the conditions deep within the earth: carbon is subjected to immense pressure and heat to crystallize into a diamond. CVD (Chemical Vapor Deposition), on the other hand, grows diamond crystals from a carbon-rich gas in a chamber. Both methods produce genuine diamonds.
It is important to make a clear distinction: lab-grown diamonds are not diamond simulants. Cubic zirconia (CZ) is zirconium dioxide, and moissanite is silicon carbide. Their chemical composition, hardness, and light refraction properties differ significantly from diamonds. Lab-grown diamonds, by contrast, are pure carbon, just like natural diamonds.
Even a professional cannot distinguish a lab-grown diamond from a natural one with the naked eye. Specialized equipment is required to detect minor growth features within the crystal structure.
Kulta-Aika’s goldsmiths in Helsinki (Kamppi) and Vantaa (Tammisto) are happy to show examples of both diamond types. With over 75 years of experience as a domestic jewelry store, our expertise extends fully to choosing lab-grown diamond rings.
Price Comparison 2026: How Much You Save and What It Means in Practice
Let’s look at a concrete budget calculation. If you have 3,000 € available, a lab-grown diamond can get you a stone of about 2.0+ carats in a quality setting. With a natural diamond, that same budget only covers a stone of roughly 0.6–0.8 carats. The difference on your finger is clearly visible.
Clear examples can be found in the Finnish market: the exact same ring model with a lab-grown diamond costs about 1,500–3,155 €, whereas the natural diamond version of the same model costs 2,176–6,086 €. The savings amount to hundreds, even thousands of euros.
Price trends tell an interesting story. In 2020, a high-quality 1-carat lab-grown diamond ring still cost 2,800–3,700 €. By 2025, prices dropped to around 740–1,110 €. In 2026, prices have stabilized at the 650–1,300 € level. The worst of the price drop is therefore behind us, and the market has leveled out, making right now a great time to buy.
The average stone size of lab-grown diamond rings continues to grow. By 2024, the center stone for lab-grown engagement rings was already averaging 2.0 carats, compared to 1.6 carats for natural diamond rings. Affordability is driving buyers to choose larger stones.
The bridal jewelry segment dominates the lab-grown diamond market with a share of nearly 50%. Engagement ring buyers have clearly embraced lab-grown diamonds, with over 70% of millennial purchases favoring them over natural ones.
Certificate Guide: IGI vs. GIA – Which One to Choose in 2026?
A diamond certificate is a buyer's most important safeguard. Without a certificate, verifying a diamond's quality afterward is impossible. Always demand a certificate.
In 2026, a significant shift has occurred in the certification landscape that few Finnish buyers know about. In October 2025, GIA changed its grading system for lab-grown diamonds. The traditional 4C scale (color, clarity, cut, carat) was replaced with two simplified categories: "Premium" and "Standard." The grading for natural diamonds remained unchanged.
In practice, this means GIA's lab-grown diamond grading no longer reveals exact color or clarity grades. GIA grades fewer than 5% of all lab-grown diamonds, so its market significance in this sector is small.
IGI (International Gemological Institute) is the most recommended certificate for lab-grown diamonds in 2026. IGI has retained the full 4C grading scale and dominates approximately 65% of lab-grown diamond certification. When you want to know precisely what kind of diamond you are buying, an IGI certificate provides the most comprehensive picture.
Other certification bodies also operate in the market, such as HRD (a European laboratory based in Antwerp) and AGS. These are reliable, but their market share in lab-grown diamonds is clearly smaller than IGI's. A simple rule for buyers: choose an IGI-certified lab-grown diamond ring so you know exactly what you are getting.
Resale Value and Investment Perspective: The Honest Answer
Let’s be straightforward: lab-grown diamonds are not suitable as investments. The resale value is typically only 10% to 30% of the purchase price. Production costs drop by 10% to 15% annually as technology advances, which will continue to place downward pressure on prices over the long term.
Natural diamonds typically retain 50% to 60% of their value, but they are not guaranteed investments either. The secondary diamond market is narrow, and an individual consumer will never recoup wholesale pricing.
McKinsey & Company called lab-grown diamonds "arguably the biggest challenge to diamond producers today" in a November 2024 report, outlining a scenario where lab-grown diamonds capture the majority of the market outside of luxury segments.
The best way to view an engagement ring is through emotional value, not as an investment. An engagement ring's value is symbolic: it represents a promise and a shared future. From this perspective, a lab-grown diamond ring offers exceptional value for money without compromising on appearance or durability.
Environmental Impact: Are Lab-Grown Diamonds Really the Greener Choice?
The figures are clear: a lab-grown diamond produced using renewable energy generates about 6 kg of CO₂ per polished carat. A mined natural diamond produces about 160 kg of CO₂ per carat. The difference is up to 97%.
However, an important caveat applies here. If lab-grown diamonds are produced using coal-fired power (as seen in some production facilities in China and India), the environmental advantage practically disappears. The energy source matters.
Consumers care increasingly more. According to a recent study, 88% of Gen Z considers sustainability an important criterion when choosing a jewelry brand. For millennials, the corresponding figure is 81%. At the same time, only 22% of Gen Z prioritizes a diamond's natural origin.
Advice for the buyer: ask the retailer or manufacturer what energy was used to produce the diamond. A responsible seller will know the answer. Mining also causes other environmental and human rights concerns, but it is fair to note that lab-grown diamonds do not automatically solve all ethical questions. The big picture is more complex.
Which One Is Right for You? A Kulta-Aika Goldsmith's Perspective
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Choose a lab-grown diamond ring if you want a larger stone on the same budget, value a smaller carbon footprint, or want to use the money saved on something like a wedding celebration or honeymoon.
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Choose a natural diamond if tradition, geological rarity, or potential resale value is important to you.
Both are real diamonds. It comes down to personal values and budget.
Kulta-Aika’s goldsmiths in Kamppi and Tammisto are happy to help you with your choice. We can create custom pieces, modify an existing ring, or help you find the exact right stone from our selection. You can also purchase your engagement ring using installment payments, so budget won't stand in the way of your dream ring.
Book an appointment at our store or browse the selection in our online store. All in-stock items are shipped within 1–2 business days. Domestic craftsmanship since 1949.