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

As of October 2026, 5.00ct+ D SI2 natural round diamonds typically cost $81,250 USD to $242,638 USD, with a median price of $120,918 USD. There are currently 46 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 35%. 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 October 2026, there are 46 natural round diamonds with D color and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $81,250 USD to $242,638 USD, with a median of $120,918 USD. At least 45 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 35%. Half of all listings fall between $17,159 USD and $24,196 USD per carat. The same specification in lab grown form lists at a median of about $351 USD per carat. Over the last 30 days the median price moved -2.5% and the number of listings moved +3.5%.

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: October 2026

Available

Lowest Price

$62,480 USD

Highest Price

$1,673,700 USD

Average Price

$155,995 USD

Market Intelligence

Retailers Selling

Cross Retailer %

36.4%

Price Spread

34.8%

30-Day Price Trend

-2.5%

30-Day Supply Change

+3.5%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$20,239/ct

10th Percentile

$14,380

Median

$20,239

90th Percentile

$28,326

Score Distribution

132 diamonds scored across 4 quality tiers

Excellent

39 (29.5%)

Very Good

31 (23.5%)

Good

26 (19.7%)

Average

36 (27.3%)

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Consider Instead

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

D I1I1 inclusions are not visible without magnification

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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