The 86.8% Spread Between Lab-Grown and Natural Diamond Prices Across 14 Million Listings

14 million diamonds, one uncomfortable number

A lab-grown diamond costs, on average, 86.8% less per carat than a natural diamond of equivalent specs. That figure comes from our live index of more than 14 million active listings across 110+ retailers, and it represents the most complete snapshot of the lab-grown vs natural diamond price gap available anywhere.

Eighty six point eight per cent. Not a sale. Not a clearance markdown. The standing market price.

Two years ago, the average discount hovered in the low 70s. The shift since then has been relentless: more lab-grown supply, stable to softening natural prices, and a retail landscape that has fully embraced lab-grown as a mainstream category. The result is a spread that would have seemed absurd half a decade ago but now simply reflects where the market sits.

We track this spread continuously through our Caratlytics methodology, standardising pricing data across the full retail landscape for apples to apples comparison. What follows is the complete picture: shape by shape, carat tier by carat tier, with matched pair examples that make the gap tangible.

Not all shapes are created equal

The 86.8% headline is an aggregate. Individual shapes tell more varied stories, and the variation matters enormously if you're shopping for a specific cut.

Shape	Natural $/ct	Lab $/ct	Discount	Combined listings
Radiant	$2,709	$374	86.2%	491,811
Baguette	$2,611	$414	84.1%	8,038
Cushion	$2,584	$416	83.9%	513,477
Oval	$2,458	$414	83.2%	1,319,132
Trillion	$3,472	$626	82.0%	11,233
Round	$2,126	$412	80.6%	3,302,297
Marquise	$2,079	$408	80.4%	416,361
Emerald	$2,004	$426	78.7%	691,122
Pear	$1,976	$427	78.4%	852,681
Princess	$2,015	$441	78.1%	376,422
Heart	$2,106	$484	77.0%	289,392
Asscher	$2,230	$716	67.9%	170,473

Radiants top the discount table at 86.2%. At just $374 per carat for the median lab-grown stone versus $2,709 for natural, this shape offers buyers the most dramatic savings in our entire index. The explanation is straightforward: radiant cuts are efficient to produce from CVD rough, so supply has scaled fast and prices have followed it down.

Cushions and ovals cluster in the 83 to 84% range, both shapes that have surged in popularity over the last three years. The lab-grown pipeline responded to that demand with enormous volume. Ovals in particular have become the poster shape for lab-grown engagement rings, and we've written a full breakdown of why the oval gap runs so wide in certain carat brackets.

At the other end of the spectrum, Asscher cuts show the narrowest discount at 67.9%. Step cut faceting is unforgiving. It doesn't mask inclusions, growth striations, or subtle colour shifts the way brilliant cuts do. Lab-grown Asschers require higher quality rough and more selective sorting, which constrains supply and keeps the lab-grown median relatively elevated at $716 per carat. Still a hefty discount from the $2,230 natural median, but nowhere near the chasm you'll find in brilliant cuts.

Round brilliants sit at 80.6%, a figure that deserves special attention because rounds account for over 3.3 million listings in our index. That's the largest shape category by a wide margin. For most engagement ring buyers, this is the benchmark they'll encounter. We've published a dedicated round brilliant pricing breakdown that goes deeper into carat and quality tiers within this shape.

The carat escalator

The spread between lab-grown and natural pricing doesn't stay constant as carat weight increases. It widens. The dynamic is simple: natural diamond prices per carat rise steeply with size because larger rough is exponentially rarer. Lab-grown prices per carat barely move, because growing a 2ct stone isn't materially harder than growing a 1ct stone. It just takes a bit more time in the reactor.

At half a carat, the gap is meaningful but contained. A buyer might save a few hundred dollars choosing lab-grown over natural. At 1 carat, the saving stretches comfortably into the thousands. By 2 carats and above, the numbers become genuinely striking. A natural 2ct G VS2 round might command $12,000 to $16,000 depending on cut quality and certification. A lab-grown stone with identical specs on the grading report can land under $2,000.

At 3 carats and beyond, the spread enters territory that makes natural diamonds feel like a different product category entirely. Natural 3ct+ stones carry enormous rarity premiums baked into every generation of the supply chain. Lab-grown 3ct stones are routine production for modern CVD facilities, particularly those running newer generation reactors with larger growth chambers. Buyers who want size and aren't paying a premium for geological origin find the maths increasingly hard to argue with.

This carat escalation effect is one of the reasons the overall index spread lands at 86.8% rather than simply mirroring the round brilliant figure of 80.6%. Larger lab-grown stones pull the aggregate discount upward because their per carat prices stay essentially flat while natural equivalents climb sharply with weight.

What $5,000 buys you today

Numbers on a table are one thing. Seeing matched pairs side by side is another. We pulled three comparisons from our index data, pairing natural and lab-grown diamonds at nearly identical specs: same shape, same colour grade, same clarity. The prices below are derived from our median per carat figures, so individual stones at specific retailers will vary. But these represent the centre of the market for each spec combination.

Pair one: 1.5ct Round, G colour, VS2 clarity

Natural (estimated from median): $3,189. Lab-grown: $618. Saving: $2,571.

That $2,571 covers a solid platinum or gold setting at most retailers, with money left over. The buyer gets the same 1.5ct round on their finger either way. Same sparkle, same dimensions, same grading language on the report.

Pair two: 2ct Oval, F colour, VS1 clarity

Natural: approximately $4,916. Lab-grown: approximately $828. Saving: $4,088.

Four thousand dollars on a single stone. For two diamonds that a trained gemologist with a loupe cannot distinguish without checking the laser inscription.

Pair three: 2ct Emerald, E colour, VVS2 clarity

Natural: roughly $4,008. Lab-grown: roughly $852. Saving: $3,156.

Emerald cuts are step cut, making them the hardest test for lab-grown quality. Even here, the saving exceeds three thousand dollars.

Comparison	Shape and Size	Natural (est.)	Lab-grown (est.)	Saving
Pair 1	1.5ct Round G VS2	$3,189	$618	$2,571
Pair 2	2ct Oval F VS1	$4,916	$828	$4,088
Pair 3	2ct Emerald E VVS2	$4,008	$852	$3,156

These are estimates derived from index medians, not listings for specific certified stones. But they reflect the pricing reality across the full dataset. A buyer using our advanced search can filter to their exact specs and see live prices from dozens of retailers, finding the actual stones behind these medians.

Twelve months of widening

Lab-grown wholesale prices have been sliding consistently through 2025 and into 2026. CVD production capacity continues to expand, with India and China accounting for the bulk of new reactor installations. More production, better yields, larger achievable rough sizes, and an increasingly competitive manufacturing landscape have combined to push wholesale costs lower quarter after quarter.

Retail prices haven't fallen at the same pace, and that disconnect is worth paying attention to. The gap between falling wholesale costs and stickier retail prices tells us that retailers have been absorbing margin on lab-grown inventory. The incentive is obvious: even at lower sticker prices, lab-grown diamonds carry healthy percentage markups. A retailer buying lab-grown wholesale for a small fraction of natural equivalent cost can price aggressively to the consumer and still enjoy strong margins per stone.

Natural diamond prices have been more stable over the same twelve month window. De Beers sight prices and secondary market rough have softened modestly, but the movement is gentle compared to the lab-grown wholesale trajectory. The net result: a widening spread, month after month. A year ago, an index wide discount in the low 80s would have been the representative figure. Now we're at 86.8%, and certain shape and carat combinations already push past 90% in our data.

For buyers, the practical implication is straightforward. There's no reason to rush a lab-grown purchase on fear of prices bouncing back. The supply trajectory points one direction, and it isn't up. Natural diamonds, by contrast, have more price stability built into their supply chain through controlled distribution and limited mining expansion. The current natural market represents reasonable value by historical standards, though nobody would call it a bargain.

Why the gap won't stop growing

Supply dominates this story. Lab-grown production has scaled from niche to industrial in under a decade. India's CVD manufacturing sector alone has expanded enormously, with thousands of reactors now operating across Gujarat and Maharashtra. Chinese producers continue adding capacity at pace. The technology has matured to the point where a 2ct or 3ct lab-grown diamond is standard output, not a headline.

Demand has shifted too. A meaningful share of engagement ring buyers under 35 now actively prefer lab-grown, motivated partly by price (the obvious draw) and partly by the sustainability narrative. Whether that narrative survives close scrutiny is debatable; CVD reactors consume substantial energy and the full lifecycle comparison with mining is genuinely complicated. But consumer perception currently favours lab-grown among younger demographics, and perception drives purchasing.

Retailers have followed the demand signal. More display space, more marketing spend, more lab-grown inventory. Jewellers who resisted the category three years ago now carry extensive lab-grown collections alongside their natural lines. Some online retailers have built their entire business model around lab-grown. The flywheel works: more supply drives lower prices, lower prices attract more buyers, more buyers encourage more production.

Certification has closed the last informational gap between the two categories. Both IGI and GIA now grade lab-grown diamonds using the same 4Cs framework applied to natural stones. A buyer comparing two grading reports sees identical language, identical scales, identical formatting. The origin disclosure is present, but the specs read the same. That equivalence has made price the dominant differentiator for any buyer who doesn't assign independent value to natural origin.

Natural diamonds haven't lost the market. They still dominate above 5 carats, in fancy colours, and among collectors and investors. The "real is rare" positioning from the natural diamond industry resonates with a specific buyer segment and probably always will. But in the core engagement ring sweet spot, roughly 0.7ct to 2.5ct white diamonds, lab-grown has captured serious share and continues to gain ground. The lab-grown diamond market in 2026 is no longer an alternative. For a growing number of buyers, it's the default.

Shape families and what they signal

Category	Shapes included	Discount range	Total lab listings	What it tells you
Round brilliant	Round	80.6%	2,089,209	The benchmark; massive supply on both sides keeps the discount wide but stable
Popular brilliants	Oval, Cushion, Radiant, Pear	78.4% to 86.2%	2,362,164	Widest discounts driven by CVD production efficiency and strong consumer demand
Step cuts	Emerald, Asscher	67.9% to 78.7%	580,226	Tighter discounts because quality constraints limit viable lab-grown supply
Niche fancies	Marquise, Heart, Princess, Trillion	77.0% to 82.0%	802,982	Mixed picture; demand niches and production complexity keep some spreads narrower

Step cuts behave like a separate market within the market. Asscher at 67.9% and emerald at 78.7% reflect the reality that step cut faceting exposes everything. Lab-grown step cuts need superior starting material and stricter quality control, so fewer stones make the grade. Buyers shopping these shapes should still expect significant savings over natural, but the gap runs roughly ten to fifteen percentage points tighter than what brilliant cuts deliver. Our step cut pricing analysis covers this in detail.

The popular brilliant category (ovals, cushions, radiants, pears) shows the widest and most consistent discounts in the index. Brilliant style faceting is forgiving of minor imperfections and subtle growth features. Lab-grown production of these shapes has scaled aggressively, and the prices reflect abundance. Radiants at 86.2% represent the single widest discount by shape in our data.

For buyers considering marquise, heart, princess, or other specialty shapes, our fancy cut comparison provides the shape by shape analysis with carat tier data.

What we're watching

The 86.8% spread is a snapshot. A comprehensive one, drawn from 14 million+ listings, but still a snapshot. The trajectory matters more than any single reading.

Lab-grown wholesale prices continue to decline. Retail prices follow at a lag. The spread between lab-grown and natural will almost certainly widen further through the remainder of 2026, barring an unexpected supply shock or a coordinated retailer repricing that hasn't shown any sign of materialising.

We'll be publishing detailed analyses for each major shape family over the coming weeks: rounds, ovals, step cuts, and fancies. Each will drill into the carat tier and quality grade breakdowns that sit beneath these headline numbers, because the headline only tells you where the market is on average. The opportunities (and the traps) live in the details.

A lab-grown diamond in 2026 costs roughly one seventh of its natural equivalent. Whether that spread stabilises or pushes past 90% depends on production growth and how quickly retailers pass wholesale declines through to consumers. Based on the last twelve months, don't bet on it slowing down.