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

As of October 2026, 5.00ct+ D SI2 natural cushion diamonds typically cost $123,769 NZD to $267,058 NZD, with a median price of $182,175 NZD. There are currently 13 diamonds matching this specification available across retailers.

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

About 50% of these diamonds are available at multiple retailers, with an average price spread of 27%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ D SI2 Natural Cushion

Quick answer

As of October 2026, there are 13 natural cushion diamonds with D colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $123,769 NZD to $267,058 NZD, with a median of $182,175 NZD. At least 26 retailers stock this exact specification, and 50% of the stones appear at more than one of them, with an average price spread of 27%. Half of all listings fall between $25,531 NZD and $33,218 NZD per carat. The same specification in lab grown form lists at a median of about $549 NZD per carat. Over the last 30 days the median price moved -4.8% and the number of listings moved +6.7%.

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. Cushion natural stones in the index: 2,948 USD per carat, +1.7% 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

$89,385 NZD

Highest Price

$388,165 NZD

Average Price

$188,820 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

50.0%

Price Spread

27.3%

30-Day Price Trend

-4.8%

30-Day Supply Change

+6.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$15,864/ct

10th Percentile

$11,681

Median

$15,864

90th Percentile

$21,873

Score Distribution

26 diamonds scored across 4 quality tiers

Excellent

4 (15.4%)

Very Good

9 (34.6%)

Good

9 (34.6%)

Average

4 (15.4%)

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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