How much does a 5.00ct+ D SI1 natural round diamond cost?

As of September 2026, 5.00ct+ D SI1 natural round diamonds typically cost €86,858 EUR to €215,147 EUR, with a median price of €135,857 EUR. There are currently 146 diamonds matching this specification available across retailers.

Where can I find the best price on a D SI1 round diamond?

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5.00ct+ D SI1 Natural Round

Quick answer

As of September 2026, there are 146 natural round diamonds with D colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run €86,858 EUR to €215,147 EUR, with a median of €135,857 EUR. At least 9 retailers stock this exact specification. Half of all listings fall between €32,549 EUR and €42,208 EUR per carat. The same specification in lab grown form lists at a median of about €294 EUR per carat.

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

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 natural stones in the index: 2,094 USD per carat, -3.8% 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

€65,865 EUR

Highest Price

€508,774 EUR

Average Price

€144,056 EUR

Market Intelligence

Retailers Selling

Price Spread

26.0%

Price Range

Price per carat distribution across retailers

$42,844/ct

10th Percentile

$30,200

Median

$42,844

90th Percentile

$56,665

Score Distribution

145 diamonds scored across 4 quality tiers

Excellent

32 (22.1%)

Very Good

39 (26.9%)

Good

42 (29.0%)

Average

32 (22.1%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

D SI2SI2 inclusions are not visible without magnification

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Lab-Grown D SI1Same 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