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

As of September 2026, 5.00ct+ J SI2 natural cushion diamonds typically cost £30,058 GBP to £150,685 GBP, with a median price of £62,890 GBP. There are currently 79 diamonds matching this specification available across retailers.

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5.00ct+ J SI2 Natural Cushion

Quick answer

As of September 2026, there are 79 natural cushion diamonds with J colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £30,058 GBP to £150,685 GBP, with a median of £62,890 GBP. At least 11 retailers stock this exact specification. Half of all listings fall between £12,276 GBP and £15,489 GBP per carat. The same specification in lab grown form lists at a median of about £10,604 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

£23,380 GBP

Highest Price

£221,007 GBP

Average Price

£78,862 GBP

Market Intelligence

Retailers Selling

Price Spread

23.2%

Price Range

Price per carat distribution across retailers

$18,704/ct

10th Percentile

$15,012

Median

$18,704

90th Percentile

$23,668

Score Distribution

79 diamonds scored across 4 quality tiers

Excellent

7 (8.9%)

Very Good

21 (26.6%)

Good

16 (20.3%)

Average

35 (44.3%)

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Consider Instead

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

Lab-Grown J SI2Same specifications, lab-grown origin

Save 24%

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