How much does a 3.00 to 4.99ct M SI2 natural round diamond cost?

As of November 6, 2026, 3.00 to 4.99ct M SI2 natural round diamonds typically cost €8,166 EUR to €22,070 EUR, with a median price of €12,856 EUR. There are currently 97 diamonds matching this specification available across retailers.

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

About 52% of these diamonds are available at multiple retailers, with an average price spread of 41%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct M SI2 Natural Round

Quick answer

As of November 6, 2026, there are 97 natural round diamonds with M colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run €8,166 EUR to €22,070 EUR, with a median of €12,856 EUR. Half of all listings fall between €3,317 EUR and €4,997 EUR per carat. The same specification in lab grown form lists at a median of about €3,510 EUR per carat. Over the last 30 days the median price moved -0.2% and the number of listings moved +9.5%.

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

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Round natural stones in the index: 2,124 USD per carat, -6.9% month on month. See the full index release

Figures come from current listings across more than 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

Lowest Price

€3,491 EUR

Highest Price

€37,288 EUR

Average Price

€14,172 EUR

Market Intelligence

Cross Retailer %

51.5%

Price Spread

41.0%

30-Day Price Trend

-0.2%

30-Day Supply Change

+9.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$4,596/ct

10th Percentile

$3,027

Median

$4,596

90th Percentile

$6,516

Score Distribution

97 diamonds scored across 4 quality tiers

Excellent

22 (22.7%)

Very Good

38 (39.2%)

Good

20 (20.6%)

Average

17 (17.5%)

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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