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 £52,382 GBP to £113,028 GBP, with a median price of £77,211 GBP. 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 35%. 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 £52,382 GBP to £113,028 GBP, with a median of £77,211 GBP. At least 29 retailers stock this exact specification, and 50% of the stones appear at more than one of them, with an average price spread of 35%. Half of all listings fall between £11,072 GBP and £15,494 GBP per carat. The same specification in lab grown form lists at a median of about £229 GBP per carat. Over the last 30 days the median price moved -4.4% and the number of listings moved +8.4%.

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

£37,830 GBP

Highest Price

£164,282 GBP

Average Price

£79,923 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

50.0%

Price Spread

35.1%

30-Day Price Trend

-4.4%

30-Day Supply Change

+8.4%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$16,769/ct

10th Percentile

$11,334

Median

$16,769

90th Percentile

$22,954

Score Distribution

28 diamonds scored across 4 quality tiers

Excellent

5 (17.9%)

Very Good

11 (39.3%)

Good

8 (28.6%)

Average

4 (14.3%)

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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