How much does a 3.00 to 4.99ct G SI2 lab grown round diamond cost?

As of October 2026, 3.00 to 4.99ct G SI2 lab grown round diamonds typically cost €617 EUR to €1,500 EUR, with a median price of €1,082 EUR. There are currently 7 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI2 round diamond?

About 19% of these diamonds are available at multiple retailers, with an average price spread of 63%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct G SI2 Lab Grown Round

Quick answer

As of October 2026, there are 7 lab grown round diamonds with G color and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run €617 EUR to €1,500 EUR, with a median of €1,082 EUR. At least 26 retailers stock this exact specification, and 19% of the stones appear at more than one of them, with an average price spread of 63%. Half of all listings fall between €220 EUR and €427 EUR per carat. The same specification in natural form lists at a median of about €11,708 EUR per carat. Over the last 30 days the median price moved +17.4% and the number of listings moved +3.0%.

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. Round lab grown stones in the index: 414 USD per carat, -5.0% 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

€334 EUR

Highest Price

€3,195 EUR

Average Price

€1,164 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

19.1%

Price Spread

63.3%

30-Day Price Trend

+17.4%

30-Day Supply Change

+3.0%

Volatility (30d)

0.07

Price Range

Price per carat distribution across retailers

$367/ct

10th Percentile

$142

Median

$367

90th Percentile

$608

Score Distribution

48 diamonds scored across 4 quality tiers

Excellent

6 (12.5%)

Very Good

1 (2.1%)

Good

2 (4.2%)

Average

39 (81.3%)

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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