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 $144,665 NZD to $432,017 NZD, with a median price of $215,295 NZD. 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 37%. 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 43 natural round diamonds with D colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $144,665 NZD to $432,017 NZD, with a median of $215,295 NZD. At least 44 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 37%. Half of all listings fall between $29,875 NZD and $43,242 NZD per carat. The same specification in lab grown form lists at a median of about $619 NZD per carat. Over the last 30 days the median price moved -2.8% and the number of listings moved +1.3%.

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

$111,246 NZD

Highest Price

$2,980,023 NZD

Average Price

$277,769 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

35.5%

Price Spread

37.3%

30-Day Price Trend

-2.8%

30-Day Supply Change

+1.3%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$20,135/ct

10th Percentile

$14,476

Median

$20,135

90th Percentile

$28,414

Score Distribution

113 diamonds scored across 4 quality tiers

Excellent

34 (30.1%)

Very Good

26 (23.0%)

Good

18 (15.9%)

Average

35 (31.0%)

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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