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

As of September 2026, 3.00 to 4.99ct J I1 lab grown round diamonds typically cost €8,063 EUR to €35,600 EUR, with a median price of €9,803 EUR. There are currently 146 diamonds matching this specification available across retailers.

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

About 1% of these diamonds are available at multiple retailers, with an average price spread of 5%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J I1 Lab Grown Round

Quick answer

As of September 2026, there are 146 lab grown round diamonds with J colour and I1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run €8,063 EUR to €35,600 EUR, with a median of €9,803 EUR. At least 4 retailers stock this exact specification, and 1% of the stones appear at more than one of them, with an average price spread of 5%. Half of all listings fall between €2,548 EUR and €2,682 EUR per carat. The same specification in natural form lists at a median of about €7,337 EUR per carat. Over the last 30 days the median price moved -5.7% and the number of listings moved -25.4%.

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

146

Lowest Price

€3,203 EUR

Highest Price

€45,567 EUR

Average Price

€15,594 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

0.8%

Price Spread

5.2%

30-Day Price Trend

-5.7%

30-Day Supply Change

-25.4%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,970/ct

10th Percentile

$2,803

Median

$2,970

90th Percentile

$3,181

Score Distribution

146 diamonds scored across 2 quality tiers

Good

110 (75.3%)

Average

36 (24.7%)

Find Your Diamond

Search 146 J I1 round diamonds and compare prices.

Search Diamonds

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