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

As of September 2026, 5.00ct+ D SI2 natural cushion diamonds typically cost £55,963 GBP to £122,461 GBP, with a median price of £78,474 GBP. There are currently 18 diamonds matching this specification available across retailers.

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

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5.00ct+ D SI2 Natural Cushion

Quick answer

As of September 2026, there are 18 natural cushion diamonds with D colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £55,963 GBP to £122,461 GBP, with a median of £78,474 GBP. At least 19 retailers stock this exact specification. Half of all listings fall between £10,790 GBP and £14,697 GBP per carat. The same specification in lab grown form lists at a median of about £222 GBP 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. Cushion natural stones in the index: 2,792 USD per carat, +1.1% 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

Lowest Price

£37,295 GBP

Highest Price

£194,469 GBP

Average Price

£81,981 GBP

Market Intelligence

Retailers Selling

Price Spread

32.6%

Price Range

Price per carat distribution across retailers

$16,175/ct

10th Percentile

$12,287

Median

$16,175

90th Percentile

$21,821

Score Distribution

18 diamonds scored across 4 quality tiers

Excellent

3 (16.7%)

Very Good

8 (44.4%)

Good

5 (27.8%)

Average

2 (11.1%)

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Consider Instead

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

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