Lab-Grown Marquise Diamond Prices
Track Lab-Grown Marquise diamond prices by carat weight - September 2026
Prices are currently high
High confidence · Based on 2,005 diamonds
We don't have enough price history for this exact combination yet, so this reflects today's live listings only: 0.0% currently qualify as strong deals.
- ✓ 0.0% of listings checked qualify as strong deals
Marquise Lab-Grown Diamond Price Trend
Marquise lab-grown diamond prices have moved −30.7% since we began tracking.
This is a local view of The Diamond Price Index, tracking the median asking price of the benchmark stone - a 1 carat marquise - indexed to 100 at the start. It shows how the lab-grown market has moved, not what any single diamond costs. See the full index at thediamondprice.com/diamond-price-index/.
Marquise Lab-Grown Diamond Prices
Based on 2,005 comparable diamonds listed right now · D,E,F,G,H,I,J,K colour, FL,IF,VVS1,VVS2,VS1,VS2,SI1,SI2 clarity · as of 2026-09-14
What the data is telling us right now
Marquise Diamond Prices by Carat
Real-time insights from 500,000+ diamonds
Make informed decisions with comprehensive market data
Best 1 carat marquise deals right now
Based on 500,000+ diamonds tracked in real time · How we compute fair prices
Marquise engagement rings
Marquise Diamond Prices by Shape
The median price of the diamonds listed right now, for each shape at the same quality band.
| Shape | Typical price range | vs Round | Live stones |
|---|---|---|---|
1ct Emerald
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|
$630 – $770 | ▼ 8% less than round | 145 |
1ct Round
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|
$690 – $740 | Reference | 518 |
1ct Radiant
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|
$710 – $900 | ▲ 6% more than round | 226 |
1ct Oval
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|
$660 – $800 | ▲ 8% more than round | 457 |
1ct Princess
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|
$660 – $790 | ▲ 8% more than round | 593 |
1ct Pear
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|
$670 – $800 | ▲ 8% more than round | 660 |
1ct Cushion
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|
$760 – $910 | ▲ 10% more than round | 108 |
1ct Marquise
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|
$660 – $940 | ▲ 10% more than round | 258 |
1ct Heart
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|
$680 – $850 | ▲ 13% more than round | 55 |
About Marquise Lab-Grown Diamond Prices
A 1 carat marquise lab-grown diamond has a fair market price of $820 right now, with most comparable stones listed between $640 and $1,430. The lowest-priced mainstream-quality stone available today is $470. These figures come from 2,005 live listings and refresh continuously.
What actually moves the price
- Carat weight - price climbs faster than size. A 2 carat stone costs 3–4x a 1 carat, not 2x, because large rough is exponentially rarer.
- Cut quality - the only C you should never compromise. It drives the sparkle that makes every other grade look better.
- Color and clarity - G–I color and VS1–SI1 clarity is where most buyers land: eye-clean, face-up white, and far cheaper than premium grades.
- Shape - marquise typically lists below round at the same quality, because round wastes more rough and carries more demand.
Compare 1 carat prices, or browse every live marquise lab-grown diamond we track in the diamond search engine.
Frequently Asked Questions
As of September 14, 2026, a 1 carat lab-grown marquise diamond runs about $803 for mainstream quality (G-I color, VS1-SI1 clarity), based on 582 listings we currently track. Most comparable stones list between $520 and $2,020. The figure updates as retailer inventory changes.
Every figure on this page is computed from live retailer listings, not a fixed price list or a manual estimate. Prices are grouped into matched quality bands (same shape, carat, color and clarity range) rather than blended across the whole market, so the number describes a comparable stone. A band needs at least 20 current listings before we publish a figure for it - below that we show nothing rather than a number we cannot stand behind. Full methodology: thediamondprice.com/research/methodology/
Carat sets the starting point, but cut, color, clarity, fluorescence and certification move the final price substantially. Cut quality has the largest visible effect: a well-cut stone returns more light and looks brighter than a larger, poorly-cut one. Two stones listed at the same carat weight can differ by several thousand dollars once those factors are accounted for.
Listings refresh continuously from live retailer feeds, and the banded figures on this page are recalculated from a daily market snapshot, so the prices shown reflect the current market rather than a periodic manual update.
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