Natural diamond prices move constantly, tracked daily by industry indices that jewellers, dealers and buyers all watch. If you own a diamond and are wondering what the current market actually looks like, this guide sets out the real 2026 index data, what has driven recent movement, and, most importantly, what any of it actually means if you are considering selling rather than buying.
Quick Answer
According to the Rapaport Diamond Price Index, natural diamond prices fell 11.3% across 2025 for 1-carat stones, before stabilising and turning modestly upward through the first half of 2026. Retail pricing for a good quality 1-carat natural diamond (G-H colour, VS clarity, excellent cut) currently sits in the region of EUR 3700 to 5500. This is a retail market index figure, not a resale or buyback price, and the two are not the same thing, which matters more than the headline number itself if you are thinking of selling.
What Do the Diamond Price Indices Actually Show for 2026?
Several independent indices track natural diamond pricing, and they broadly tell the same story. The Rapaport Diamond Price Index recorded an 11.3% decline across 2025 for 1-carat natural diamonds, with a further 2.3% dip in December 2025 alone. The IDEX Diamond Index stood at 84.97 in January 2026, having eased slightly from December's reading. Separately, PriceScope's live tracking of natural diamond listings showed a soft April 2026, followed by a recovery through May and continued gains into June and July, with every carat range it tracks posting positive movement in the most recent reading.
Taken together, the picture is a market that corrected sharply through 2025 and has begun a measured recovery in 2026, rather than one moving sharply in either direction right now.
Why Did Natural Diamond Prices Fall Through 2025?
The decline was driven primarily by the rapid growth of the lab-grown diamond market, which put sustained pricing pressure on mid-tier natural stones, particularly in the 1 to 2 carat range where natural and lab-grown options are most directly compared by buyers. Softer consumer spending on luxury goods through the period added further pressure. Larger, rarer natural stones were affected far less than smaller commercial-grade diamonds, a pattern consistent with how scarcity drives natural diamond pricing generally.
Important: Retail Index Prices Are Not the Same as What a Diamond Resells For
This is the point most coverage of diamond price indices leaves out, and it matters more than any individual figure above. Every index and retail figure in this article describes what a buyer pays a jeweller today, the retail price. It does not describe what a seller receives when selling a diamond they already own, the resale price. According to Diamond Brothers, this is the same structural gap covered in the difference between market value and resale value: retail pricing includes margin, marketing and overheads that were never part of the stone's underlying wholesale worth, and a resale offer is built on that wholesale figure instead. Whether the index shows prices moving up or down, that structural gap between retail and resale exists regardless, so a headline index figure is not a stand-in for what your own diamond would fetch on resale.
Do Prices Scale Evenly With Carat Weight?
No, and this is one of the more important things for an owner to understand. A 2-carat natural diamond of identical quality does not cost roughly twice a 1-carat stone, it typically costs 4 to 5 times more, because finding rough that yields a high-quality 2-carat polished stone is exponentially rarer than finding rough for a 1-carat stone. This effect compounds further at larger sizes, a well-graded 3-carat stone can carry a per-carat price 10 to 15 times higher than an equivalent 1-carat stone, based on current industry reporting. This is why price per carat, rather than total price, is the figure the trade actually uses to compare stones of different sizes.
|
Carat Weight |
Approx. Retail Multiple vs 1ct (same quality) |
Why |
|
1.00ct |
Baseline |
Reference point |
|
2.00ct |
Roughly 4 to 5x total price |
High-quality 2ct rough is exponentially rarer |
|
3.00ct+ |
Roughly 10 to 15x per-carat price |
Investment-grade rarity, limited comparable supply |
(Figures reflect current 2026 industry reporting for well-graded round brilliants at retail, and are directional, not a valuation of any specific stone or an indication of resale value.)
How Does Natural Compare to Lab-Grown on Price Today?
The gap between natural and lab-grown pricing has widened substantially. A 1-carat lab-grown stone of comparable visual quality now retails for roughly EUR 670 to 1400, against EUR 3700 to 5500 for a natural stone of similar grade, a difference driven entirely by supply structure, natural diamonds are geologically scarce, while lab-grown production scaled sharply in recent years and pushed wholesale lab-grown prices down with it. The gap is not a quality difference, at identical grading the two are visually indistinguishable even under magnification, it is a difference in how each is produced and how each behaves on resale, where natural diamonds have historically held a stronger position. Understanding how GIA and IGI grading differ is also relevant here, since certification standards and resale expectations differ between the two categories.
What Does This Mean for Someone Considering Selling a Natural Diamond?
Retail index figures describe the broader buying market, not what a specific stone will fetch on resale. According to Diamond Brothers, natural diamonds have historically retained a meaningfully stronger share of their value on resale compared with lab-grown stones, consistent with natural diamonds' comparative scarcity and established secondary market. What this means practically is that natural diamond ownership continues to hold a resale position that lab-grown stones do not, but the exact figure for an individual stone still depends on its own cut, colour, clarity and carat weight, assessed directly rather than read off an index. Understanding what your diamond is worth explains how those variables translate into an actual offer.
How Do You Get an Accurate Figure for Your Own Diamond?
Index data is a useful backdrop, but it is not a valuation, and nothing in this article should be read as one. A certified gemologist assesses your specific stone against the 4Cs, checks any certification, and prices it against current wholesale demand, giving you a figure grounded in your actual diamond rather than a retail market average. Sellers can begin with a free expert valuation, with no obligation to sell, and the process is set out at how to sell with Diamond Brothers.
Conclusion
Natural diamond prices moved through a significant correction in 2025 and have begun stabilising and recovering through 2026, according to the major industry indices. Per-carat pricing scales sharply rather than evenly with size, and natural diamonds continue to hold a distinct resale position relative to lab-grown stones. What matters most for an owner is understanding that every figure here describes the retail market, not resale value, and that a direct assessment is the only way to know what a specific diamond is actually worth to sell.
Diamond Brothers, based in Antwerp, operates within Europe's established diamond trade. The company purchases diamonds, diamond jewellery, coloured diamonds and gemstones, offers free expert valuations and provides secured shipping for clients across Europe.
FAQs
What is the natural diamond price per carat in 2026?
According to current index data, a good quality 1-carat natural diamond (G-H colour, VS clarity, excellent cut) retails in the region of EUR 3700 to 5500. This is a retail market figure, not a resale value, and the exact worth of a specific stone to sell depends on its own grading, assessed directly.
Is the retail diamond price the same as what I would get selling my diamond?
No, and this is the most important distinction in diamond pricing. Retail price includes margin, marketing and overheads that never transfer to a resale offer. A resale offer reflects wholesale value instead, which is why retail index figures should never be treated as an estimate of what a seller would receive.
Have natural diamond prices gone up or down in 2026?
Natural diamond prices fell 11.3% across 2025 according to the Rapaport Diamond Price Index, before stabilising and turning modestly upward through the first half of 2026, with PriceScope data showing gains across all tracked carat ranges from May onward.
Why does a 2-carat diamond cost more than double a 1-carat diamond?
Because high-quality rough large enough to yield a 2-carat polished stone is exponentially rarer than rough for a 1-carat stone. A 2-carat stone of equivalent quality typically costs 4 to 5 times more at retail than a 1-carat stone, not twice as much.
How does natural diamond pricing compare to lab-grown in 2026?
A 1-carat lab-grown diamond of comparable visual quality retails for roughly EUR 670 to 1400, against EUR 3700 to 5500 for a natural stone of similar grade. The difference reflects supply and production structure, not a difference in visible quality, and natural diamonds have historically held a stronger resale position.
Does market index data tell me what my own diamond is worth?
No. Index figures reflect general retail market pricing for a defined quality benchmark and do not account for your stone's specific cut, colour, clarity, carat weight, condition or certification, nor do they reflect resale value. A direct assessment by a certified gemologist is needed for an accurate figure.
