How much does a 3.00 to 4.99ct I I1 lab grown round diamond cost?

As of September 2026, 3.00 to 4.99ct I I1 lab grown round diamonds typically cost €9,124 EUR to €34,327 EUR, with a median price of €18,976 EUR. There are currently 30 diamonds matching this specification available across retailers.

Where can I find the best price on a I I1 round diamond?

About 15% of these diamonds are available at multiple retailers, with an average price spread of 79%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I I1 Lab Grown Round

Quick answer

As of September 2026, there are 30 lab grown round diamonds with I colour and I1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run €9,124 EUR to €34,327 EUR, with a median of €18,976 EUR. At least 9 retailers stock this exact specification, and 15% of the stones appear at more than one of them, with an average price spread of 79%. Half of all listings fall between €2,673 EUR and €5,614 EUR per carat. The same specification in natural form lists at a median of about €7,983 EUR per carat. Over the last 30 days the median price moved -33.9% and the number of listings moved -60.3%.

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

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Round lab grown stones in the index: 438 USD per carat, -14.1% month on month. See the full index release

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

Last updated: September 2026

Available

Lowest Price

€7,966 EUR

Highest Price

€46,614 EUR

Average Price

€19,237 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

14.7%

Price Spread

79.2%

30-Day Price Trend

-33.9%

30-Day Supply Change

-60.3%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$4,283/ct

10th Percentile

$2,868

Median

$4,283

90th Percentile

$10,368

Score Distribution

30 diamonds scored across 3 quality tiers

Very Good

9 (30.0%)

Good

8 (26.7%)

Average

13 (43.3%)

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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