Diamond Prices Are Rising Again — the First 1-Carat Gain in 15 Months
After more than a year of falling numbers, the benchmark diamond index just ticked up. Here's what August's quiet turnaround means if a diamond is on your list this year.
The Diamond Market Just Turned a Corner
For the better part of two years, the story of natural diamonds has been one long slide downward. That story changed this week. In its August market report, published September 2, 2026, Rapaport — the industry's benchmark price authority — confirmed that diamond prices extended their recovery in August, and that the closely-watched 1-carat category posted a gain for the first time in 15 months.
It is a small number with a large meaning. The 1-carat round is the single most-searched, most-purchased diamond size in the world — the default choice for engagement rings across the United States. When that category stops falling and starts rising, it tends to signal that the wider market has found its floor.
The Rapaport Trade Diamond Index (RAPI™), which tracks asking prices for round, D–H, IF–VS2 diamonds, rose 0.5% for 1-carat stones in August — its first increase since May 2025. Smaller stones led the way even more decisively: 0.30-carat goods jumped 2%, and 0.50-carat goods advanced 2.5%. Only the largest 3-carat category slipped slightly, down 0.4% after a year and a half of holding steady.
A clean macro shot of a single round brilliant 1-carat diamond held in tweezers against a dark background. FOREVER ROXSupply Discipline Finally Paid Off
Prices do not rebound by accident. Behind August's numbers is a deliberate squeeze on supply. Miners and manufacturers spent much of the past year cutting production hard, pulling rough diamonds out of the pipeline until the glut that crushed prices in 2025 began to clear. As Rapaport put it, "supply cuts paid off and demand stabilized."
Rounds from 0.30 to 0.69 carats led the comeback as that rebalancing took hold, while 1- to 1.49-carat goods steadied on thinning inventories. Trading picked up after the sleepy summer months, Indian cutters shipped fresh goods into the U.S. ahead of the holidays, and the mood at the big India International Jewellery Show in Mumbai was noticeably brighter.
"The categories that suffered the most in 2025 saw an ongoing rebound as supply cuts paid off and demand stabilized. Steady demand and a disciplined approach to production will ensure that the cautious market recovery holds."
| Diamond Category | August Price Move |
|---|---|
| 0.30 ct. | +2.0% — strong rebound |
| 0.50 ct. | +2.5% — leading the recovery |
| 1.00 ct. | +0.5% — first gain in 15 months |
| 1.50 ct.+ | Solid, especially larger commercial goods |
| 3.00 ct. | −0.4% — the lone slip |
Shoppers Are Cooling on Lab-Grown
There's a second engine under this recovery, and it matters for anyone weighing their options. Rapaport specifically noted that 1- to 1.49-carat natural goods stabilized "amid inventory declines and reports of consumers cooling on lab-grown diamonds."
The math behind that shift has become hard to ignore. Lab-grown prices have collapsed as production scaled up — a synthetic stone that felt like a savvy buy a few years ago can be worth a fraction of its purchase price today, with no floor in sight. Natural diamonds, by contrast, are a finite resource with a resale market and a recovering price index. For buyers who care about long-term value, that contrast is doing exactly what the natural-diamond trade hoped it would. We unpacked the same value question when country star Lainey Wilson's $250,000 diamond cluster ring put the natural-versus-lab-grown debate back in the spotlight.
The Miners Are Still Feeling the Pain
Make no mistake — this is a recovery, not a boom. The big producers are still nursing heavy losses from the downturn, which is precisely why they cut supply so aggressively. Their pain is the market's medicine.
| Producer | First-Half 2026 Result |
|---|---|
| De Beers | Revenue down 19% year on year to $1.58 billion; losses trimmed on steadier prices |
| Alrosa | Revenue down 36% to roughly $901.6 million; posted a first-half loss |
| Takeaway | Deep production cuts drained the oversupply that sank prices — and set the stage for August's rebound |
With inventories leaner and the industry's focus now shifting squarely to the holiday and engagement season, the trade appears to have enough goods for the season — though shortages are already showing up in some of the most sought-after categories.
If a Diamond Is on Your List This Year
For most of the past two years, buyers have enjoyed a rare luxury: time. Prices kept easing, so there was little penalty for waiting. August's report is the first real sign that the window of falling prices may be closing — and it arrives right as engagement season and the holidays ramp up.
This is not a reason to panic-buy. It is a reason to buy smart. A 0.5% monthly uptick is gentle, but recoveries in this market tend to build quietly before they accelerate, and the categories moving fastest — half-carat and one-carat rounds — are exactly the sizes most couples shop for. If you've been circling a bridal or engagement piece, the value equation has quietly tilted toward acting sooner rather than later.
Engagement Sizes Are Moving
Half-carat and one-carat rounds led August's gains — the very sizes most in demand for proposals.
The Floor Looks Set
A 15-month drought of 1-carat gains just ended. Historically, that kind of turn signals a bottom.
Natural Holds Value
As lab-grown prices keep sliding, natural diamonds keep their finite-supply, resale-backed edge.
Holiday Shortages Loom
Leaner inventories mean the best stones in popular grades may get harder to source into December.
A Quiet Number Worth Watching
No celebrity wore it, and it won't trend on social media — but August's half-percent tick in the 1-carat index may end up being one of the more consequential diamond stories of the year. It marks the moment the market stopped falling and started climbing again. For anyone shopping a natural diamond this fall, the smartest move is simple: understand what you're buying, buy the best quality you can, and know that the era of endlessly falling prices appears to be behind us. If you're weighing a stone, our team is always happy to walk you through cut, color, clarity, and carat on any piece in our diamond collection.
See a Diamond in Person Before You Decide
At Forever Rox Fine Jewelry in Incline Village, Lake Tahoe, we've helped clients choose the right natural diamond — for the right price — since 1984. Whether it's an engagement ring or a milestone gift, we'll help you buy with confidence.
Explore Forever RoxForever Rox Fine Jewelry · Incline Village, Lake Tahoe, NV · (775) 831-4544 · foreverrox.com · Since 1984
Diamond Prices, Answered
Are diamond prices going up in 2026?
They're starting to. According to Rapaport's report published September 2, 2026, diamond prices extended their recovery in August, and the benchmark 1-carat index rose 0.5% — its first monthly gain in 15 months. Smaller stones rose even more, with half-carat goods up 2.5%. It's an early, gentle recovery rather than a spike, but the direction has clearly changed.
Why are natural diamond prices recovering now?
Two main reasons. First, miners and manufacturers cut production sharply to drain the oversupply that pushed prices down through 2025. Second, demand stabilized as many shoppers cooled on lab-grown diamonds and returned to natural stones. Together, tighter supply and steadier demand pushed the index back up.
Should I buy a diamond now or wait?
For two years, waiting meant lower prices. August's report is the first sign that window may be closing, especially in the half-carat and one-carat sizes most couples shop for. There's no need to rush, but the value equation has tilted toward buying sooner rather than later — particularly with holiday and engagement-season demand tightening inventory.
What's happening with lab-grown diamond prices?
Lab-grown prices have kept falling as production scaled up, and there's little sign of a floor. That's a key reason natural diamonds are stabilizing — buyers increasingly see natural stones as the better long-term store of value, since they're finite and hold a resale market.
What is the Rapaport (RAPI) diamond index?
The Rapaport Trade Diamond Index tracks average asking prices for round, D–H color, IF–VS2 clarity diamonds traded on the industry's largest online marketplace. It's the closest thing the diamond world has to a benchmark stock ticker, which is why a move in the 1-carat RAPI draws so much attention.
Does a rising index mean every diamond costs more?
Not uniformly. The index measures broad asking-price trends by size and quality, and August's moves varied — half-carat and one-carat goods rose, while the 3-carat category dipped slightly. Individual prices still depend on the specific cut, color, clarity, and certification of a given stone, which is why seeing a diamond in person matters.
