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

As of October 2026, 5.00ct+ E SI2 natural cushion diamonds typically cost £42,189 GBP to £80,362 GBP, with a median price of £61,840 GBP. There are currently 14 diamonds matching this specification available across retailers.

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

About 50% of these diamonds are available at multiple retailers, with an average price spread of 32%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ E SI2 Natural Cushion

Quick answer

As of October 2026, there are 14 natural cushion diamonds with E colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £42,189 GBP to £80,362 GBP, with a median of £61,840 GBP. At least 31 retailers stock this exact specification, and 50% of the stones appear at more than one of them, with an average price spread of 32%. Half of all listings fall between £11,342 GBP and £15,408 GBP per carat. The same specification in lab grown form lists at a median of about £309 GBP per carat. Over the last 30 days the median price moved -4.8% and the number of listings moved +8.2%.

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

£35,995 GBP

Highest Price

£114,167 GBP

Average Price

£62,473 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

50.0%

Price Spread

31.8%

30-Day Price Trend

-4.8%

30-Day Supply Change

+8.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$17,126/ct

10th Percentile

$12,443

Median

$17,126

90th Percentile

$24,548

Score Distribution

22 diamonds scored across 4 quality tiers

Excellent

7 (31.8%)

Very Good

9 (40.9%)

Good

4 (18.2%)

Average

2 (9.1%)

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Consider Instead

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

F SI2F colour is visually identical to E to the naked eye

Save 9%

Lab-Grown E SI2Same specifications, lab-grown origin

Save 97%

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