How much does a 5.00ct+ D SI2 natural round diamond cost?

As of November 2026, 5.00ct+ D SI2 natural round diamonds typically cost €72,831 EUR to €215,869 EUR, with a median price of €108,229 EUR. There are currently 43 diamonds matching this specification available across retailers.

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

About 35% of these diamonds are available at multiple retailers, with an average price spread of 34%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ D SI2 Natural Round

Quick answer

As of November 2026, there are 43 natural round diamonds with D color and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run €72,831 EUR to €215,869 EUR, with a median of €108,229 EUR. At least 43 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 34%. Half of all listings fall between €14,839 EUR and €20,802 EUR per carat. The same specification in lab grown form lists at a median of about €323 EUR per carat. Over the last 30 days the median price moved -2.7% and the number of listings moved +3.7%.

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 natural stones in the index: 2,248 USD per carat, +7.6% 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: November 2026

Available

Lowest Price

€55,925 EUR

Highest Price

€1,498,112 EUR

Average Price

€139,251 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

35.2%

Price Spread

34.2%

30-Day Price Trend

-2.7%

30-Day Supply Change

+3.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$19,457/ct

10th Percentile

$14,273

Median

$19,457

90th Percentile

$27,701

Score Distribution

114 diamonds scored across 4 quality tiers

Excellent

33 (28.9%)

Very Good

28 (24.6%)

Good

18 (15.8%)

Average

35 (30.7%)

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Lab-Grown D SI2Same specifications, lab-grown origin

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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