How much does a 5.00ct+ I VS1 lab grown marquise diamond cost?

As of October 2026, 5.00ct+ I VS1 lab grown marquise diamonds typically cost $874 USD to $11,739 USD, with a median price of $3,740 USD. There are currently 19 diamonds matching this specification available across retailers.

Where can I find the best price on a I VS1 marquise diamond?

About 33% of these diamonds are available at multiple retailers, with an average price spread of 106%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ I VS1 Lab Grown Marquise

Quick answer

As of October 2026, there are 19 lab grown marquise diamonds with I color and VS1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $874 USD to $11,739 USD, with a median of $3,740 USD. At least 23 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 106%. Half of all listings fall between $276 USD and $861 USD per carat. Over the last 30 days the median price moved -12.6% and the number of listings moved +49.7%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Marquise lab grown stones in the index: 485 USD per carat, -3.2% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

Lowest Price

$609 USD

Highest Price

$28,204 USD

Average Price

$5,637 USD

Market Intelligence

Retailers Selling

Cross Retailer %

32.6%

Price Spread

105.7%

30-Day Price Trend

-12.6%

30-Day Supply Change

+49.7%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$553/ct

10th Percentile

$183

Median

$553

90th Percentile

$1,242

Score Distribution

38 diamonds scored across 4 quality tiers

Excellent

13 (34.2%)

Very Good

5 (13.2%)

Good

7 (18.4%)

Average

13 (34.2%)

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1