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

As of November 6, 2026, 3.00 to 4.99ct K SI2 natural round diamonds typically cost €12,412 EUR to €37,204 EUR, with a median price of €21,668 EUR. There are currently 723 diamonds matching this specification available across retailers.

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

About 47% of these diamonds are available at multiple retailers, with an average price spread of 46%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct K SI2 Natural Round

Quick answer

As of November 6, 2026, there are 723 natural round diamonds with K colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run €12,412 EUR to €37,204 EUR, with a median of €21,668 EUR. Half of all listings fall between €5,075 EUR and €8,011 EUR per carat. The same specification in lab grown form lists at a median of about €2,513 EUR per carat. Over the last 30 days the median price moved -1.5% and the number of listings moved +12.6%.

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

723

Lowest Price

€3,705 EUR

Highest Price

€86,492 EUR

Average Price

€23,350 EUR

Market Intelligence

Cross Retailer %

47.0%

Price Spread

45.8%

30-Day Price Trend

-1.5%

30-Day Supply Change

+12.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$7,198/ct

10th Percentile

$4,352

Median

$7,198

90th Percentile

$11,210

Score Distribution

723 diamonds scored across 4 quality tiers

Excellent

200 (27.7%)

Very Good

199 (27.5%)

Good

109 (15.1%)

Average

215 (29.7%)

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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