The American engagement ring market has entered a decisive new phase.
According to The Knot Real Weddings Study 2026, which surveyed 10,474 US couples married between January 1 and December 31, 2025, lab-grown diamonds now account for 61% of all engagement ring center stones. This represents a 239% increase since 2020 and confirms a structural shift in buyer behaviour rather than a short-term trend.
For European buyers, this data is significant. The United States often leads consumer adoption cycles in bridal jewellery. Design preferences, spending psychology, and sourcing choices that gain traction in the US frequently surface in Europe within a few years, often with a more measured and design-conscious interpretation.
At Carateu, we view the American market not as something to imitate blindly, but as an early indicator of where sentiment is moving.
The 2026 study offers several important lessons.
1. Lab-Grown Diamonds Are Now the Majority Choice
The most striking figure from the report is this:
61% of engagement rings in 2025 featured a lab-grown center stone.
In addition, 40% of couples stated it was specifically important that their diamond be lab-grown, citing economic pragmatism and evolving values as key drivers.
This is a meaningful cultural shift. Lab-grown diamonds in the US are no longer framed as alternatives. They are the preferred choice for a majority of buyers.
For European consumers, particularly in markets where sustainability and transparency are central purchasing criteria, this aligns naturally with broader buying behaviour. Younger buyers in particular are comfortable with technological production when quality and certification standards are equivalent.
At Carateu, we see this reflected in the nature of client conversations. Questions are no longer about whether lab-grown diamonds are real. They are about cut proportions, fluorescence, light performance, and certification.
The discussion has matured.
2. Larger Carats, Lower Average Spend
The study highlights a structural shift in how couples allocate budget.
In 2025:
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The average engagement ring spend was $4,600
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The average center stone size increased to 1.9 carats
When broken down by origin:
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Natural diamonds averaged $7,000 at 1.6 carats
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Lab-grown diamonds averaged $4,300 at 2.0 carats
In other words, couples are spending less while wearing larger stones.
This is not a reduction in aspiration. It is a recalibration of value.
For European buyers navigating higher housing costs, inflation, and financial caution, this is highly relevant. The American market shows that visual impact and financial discipline can coexist.
At Carateu, our online-only structure eliminates traditional showroom overhead. This allows us to price both natural and lab-grown diamonds competitively while maintaining full certification transparency and European VAT clarity.
The American data confirms what we observe daily: modern buyers are optimising, not downsizing.
3. Design Preferences Remain Timeless
Despite shifts in sourcing, aesthetic preferences remain remarkably classic.
According to the study:
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Round brilliant remains the most popular shape at 26%
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Oval follows closely at 25%
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Emerald, princess, pear, and marquise each represent 8%
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38% chose solitaire settings
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83% selected clear diamonds
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Yellow gold accounts for 39% of metal choices, rising sharply over five years
The return of yellow gold and the continued dominance of solitaire settings suggest that while sourcing evolves, design fundamentals remain stable.
European buyers traditionally favour understated elegance. The American data reinforces that timeless forms outperform overly trend-driven styles.
At Carateu, we see consistent demand for minimalist solitaires paired with carefully selected diamonds where proportions and light performance take precedence over ornamentation.
The evolution is in sourcing and budget allocation, not in abandoning classic design.
4. Customisation Is Now Standard
The report shows that 88% of couples made custom edits or fully custom-designed their ring.
Modern buyers expect participation. They want to select the exact diamond, adjust band width, choose metal colour, and refine setting details.
The era of purchasing from a static display without modification is fading.
This shift supports the online-first model when executed correctly. Customisation does not require a physical showroom. It requires transparent specifications, certification, and clear communication.
At Carateu, clients select certified diamonds individually and pair them with made-to-order settings. This reflects how contemporary buyers prefer to shop: informed, deliberate, and personalised.
The American market confirms that this approach is not niche. It is becoming the standard expectation.
5. Physical Stores Still Matter, But Confidence Matters More
The study reports that:
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64% of buyers completed their purchase in person
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Buyers visited an average of two retailers
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Proposers looked at around 10 rings physically before purchasing
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One third completed their purchase online
This does not signal a rejection of e-commerce. It signals a demand for reassurance.
In-store purchases provide tactile confirmation. Online retailers must provide equivalent confidence through transparency and policy.
At Carateu, this is addressed through:
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Full certificate disclosure
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Detailed specifications
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Transparent pricing
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Personalised guidance
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A 14-day return policy
If a diamond or ring does not meet expectations once seen in person, clients may return it within the return window.
Online purchasing should expand access and pricing efficiency. It should not reduce security.
The American data makes one principle clear: trust drives decisions more than channel.
6. Cultural Meaning Is Shifting
Beyond pricing and carat size, the deeper change is psychological.
The study indicates that American couples are increasingly motivated by:
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Economic pragmatism
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Personal values
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Intentional decision-making
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Individual expression
The traditional expectation of allocating a fixed multiple of salary toward a ring is fading. In its place is a more analytical and transparent approach.
Europe has long valued craftsmanship and proportion. The American shift does not conflict with these values. It complements them by introducing technological sourcing into an otherwise timeless design philosophy.
Lab-grown diamonds do not diminish symbolic meaning. They simply alter the framework in which decisions are made.
What This Means for European Buyers
The American engagement ring market in 2025 offers a preview of where global bridal jewellery is heading.
The signals are consistent:
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Lab-grown diamonds will continue gaining market share.
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Average carat sizes will likely increase.
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Spending will remain disciplined.
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Customisation will become expected.
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Timeless design will persist.
For European buyers, the key is not imitation. It is informed interpretation.
At Carateu, we believe the future of engagement rings in Europe lies in balance:
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Technological innovation alongside traditional craftsmanship.
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Competitive pricing supported by certification transparency.
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Online efficiency reinforced by a clear return policy.
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Modern sourcing aligned with timeless design principles.
The Knot Real Weddings Study 2026 shows that engagement rings are not becoming less meaningful. They are becoming more intentional.
For modern European buyers, that is not a disruption. It is simply progress.
