How Much Does a 1.5 Carat Diamond Cost

A 1.5 carat natural diamond costs $7,569 at the median across current October 2026 listings, based on CaratHunter's index of 360,323 natural stones in the 1.5 to 2ct weight tier. Lab-grown sits at $564. The P10 to P90 spread runs $3,440 to $16,116 for natural and $246 to $1,670 for lab-grown. Both figures are USD and reflect the best available price per stone at the time of writing.

If you need the broader context on how carat size drives price, start with our 1 carat diamond price guide. This post focuses narrowly on the 1.5ct tier: what the price bands mean, which specs represent genuine value, and where buyers consistently overpay.

The price band, by origin

Origin	P10	Median	P90	Median per carat
Natural	$3,440	$7,569	$16,116	$4,764
Lab-grown	$246	$564	$1,670	$344

That's a 13.4 to 1 ratio between origins at this size. Not a small discount. Two different markets.

The breadth of the natural range is the first thing to absorb. A $3,440 natural 1.5ct and a $16,116 natural 1.5ct will look identical to an untrained eye in most lighting conditions. The difference lives entirely on the grading report. Understanding which specs justify which prices is the whole point.

Lab-grown's P90 sits at $1,670. The most expensive 10% of lab-grown stones at this size are still well below the cheapest 10% of natural stones. There is no overlap. Anyone telling you lab-grown can be priced near natural at 1.5ct is describing an outlier you're unlikely to encounter in the market.

Inside the natural band

Colour and clarity drive most of the variation in natural pricing. The most stocked natural cell in the index at this size is H SI2, with a median of $5,550. That's below the overall natural median of $7,569, and it's the spec most often cited as the value position at 1.5ct. It genuinely is. H sits in the nearly colourless range; SI2 is eye-clean when the stone is well-cut. Nothing meaningful is sacrificed visually.

Natural certification sits at 42% across this weight range, which is lower than most buyers expect. For a stone at this price, buying uncertified is a genuine risk. Retailer grading accuracy varies significantly, and at $7,569 median, a GIA or IGI report gives you pricing transparency, resale protection, and the ability to compare across the market on identical terms.

The premium steps get steep as you move up the grading scale. D Flawless natural rounds sit in a collector's tier. The price premium above D VS1 isn't about visual performance. It's about rarity. That's a legitimate thing to buy; it's just not what most engagement ring buyers need, and the market prices it accordingly.

Lab-grown at 1.5ct

957,652 lab-grown stones in this weight range. That depth matters. The market is stocked heavily at the top end of the grading scale, and pricing between adjacent clarity grades has essentially flattened.

Colour	Clarity	Stones	Median
E	VVS2	143,763	$531
D	VVS2	138,422	$516
E	VS1	134,658	$561
D	VS1	104,694	$542
D	VVS1	59,243	$542
F	VVS2	57,778	$526
F	VS1	56,903	$564
D	IF	19,633	$872
D	FL	13,005	$1,116

D VVS2 at $516. D VVS1 at $542. A $26 difference. The market has effectively decided there's no meaningful distinction between those two clarity grades in lab-grown at this size, and inventory confirms it: VVS1 is stocked at less than half the volume of VVS2.

D IF at $872 and D FL at $1,116 are a different matter. You're paying 61% more for IF over VVS1, and more than double the VVS2 price for FL. In natural diamonds, Internally Flawless and Flawless represent genuine rarity. In lab-grown, they don't. That premium exists because retailers price to what buyers will pay, not because the stone performs differently from a VVS2 in any setting. The D VVS1 fair price guide for 1.5ct rounds gives you current benchmarks for that specific spec.

52% of lab-grown stones at this size carry a grading certificate. A portion of the uncertified inventory sits at lower price points where buyers accept retailer grading. At $564 median, the certified segment is well-represented. Below $400, it's thinner.

Shape and the premium that comes with it

In lab-grown, rounds carry the lowest median at $501. Ovals ($570), pears ($547), and emeralds ($545) form a middle tier. Cushion at $627 sits at the upper end of the most common shapes. The $126 gap between round and cushion is driven by supply: 311,848 round lab-grown stones in the index versus 65,717 cushions. Volume drives price down.

Origin	Shape	Stones	Median
Lab-grown	Round	311,848	$501
Lab-grown	Oval	157,547	$570
Lab-grown	Pear	90,696	$547
Lab-grown	Emerald	80,942	$545
Lab-grown	Cushion	65,717	$627
Natural	Round	138,133	$7,947
Natural	Oval	52,355	$7,923
Natural	Cushion	37,417	$6,275
Natural	Princess	18,493	$6,455

Natural shapes tell a more interesting story. Round and oval sit at nearly identical medians: $7,947 and $7,923. That parity is unusual. Oval has historically traded at a discount to round in natural diamonds; the gap has essentially closed at this size tier. If you bought an oval as a value play a few years ago, you timed it well. At current prices, the arbitrage is gone.

Cushion natural at $6,275 and princess at $6,455 both sit meaningfully below round and oval. If you're buying a natural 1.5ct and shape isn't fixed, cushion represents a real saving. $1,672 below the round median, with comparable visual weight when cut well.

The natural round 1.5ct price index shows how cut grade affects the spread if you're staying with that shape.

Why the same stone shows at different prices

48% of lab-grown stones at this size appear at two or more retailers. For natural, that figure is 40%. Both numbers are significant.

The same stone, same grading report number, same specs, can appear at different prices across retailers. Sometimes the gap is modest; at $564 median, a $50 difference matters more than it would on a $7,000 stone. For lab-grown at this tier, the share of stones listed at two or more retailers means comparing across platforms isn't optional if you're trying to buy at market price.

This is also where certification matters beyond just the grade. A GIA or IGI report number is findable. You can look the stone up, see where it's listed, and compare across retailers on identical terms. An uncertified stone doesn't give you that. You're trusting the retailer's description entirely.

The buying rule at 1.5ct

For lab-grown: the value concentrates in D to F colour, VS1 to VVS2 clarity. D VVS2 at $516, E VVS2 at $531, F VVS2 at $526. Those are nearly identical prices for top-tier colour and clarity. Stay in that range. The step up to VVS1 gains you nothing visible at $542; IF and FL carry premiums that reflect retail positioning rather than optical performance.

For natural: H SI2 at $5,550 median is the honest sweet spot. Eye-clean, nearly colourless, and $2,019 below the overall natural median. Going to SI1 can work, but SI1 grading at 1.5ct varies enough that two stones with the same grade can look quite different. Confirm eye-clean on the specific stone, not just the grade.

For natural buyers open on shape, the cushion median of $6,275 versus round's $7,947 is a $1,672 real saving. That difference pays for a significantly better setting, or it stays in your pocket.

The full 1.5 carat price index shows current listings across all spec combinations, and the where to buy natural 1.5ct rounds page tracks how pricing splits across specific retailers.

We're watching the natural oval to round parity closely. If oval breaks above round at this size, it'll be a meaningful shift in buying advice. Check current listings before you commit: the spread between those two shapes has narrowed faster than most buyers realise.