How much does a 5.00ct+ E SI1 natural cushion diamond cost?

As of October 2026, 5.00ct+ E SI1 natural cushion diamonds typically cost £62,133 GBP to £244,850 GBP, with a median price of £98,641 GBP. There are currently 24 diamonds matching this specification available across retailers.

Where can I find the best price on a E SI1 cushion diamond?

Compare prices across retailers on Carat Hunter to see all your options.

5.00ct+ E SI1 Natural Cushion

Quick answer

As of October 2026, there are 24 natural cushion diamonds with E colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £62,133 GBP to £244,850 GBP, with a median of £98,641 GBP. The same specification in lab grown form lists at a median of about £290 GBP per carat.

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

£45,760 GBP

Highest Price

£379,230 GBP

Average Price

£120,051 GBP

Score Distribution

53 diamonds scored across 4 quality tiers

Excellent

8 (15.1%)

Very Good

10 (18.9%)

Good

16 (30.2%)

Average

19 (35.8%)

Find Your Diamond

Search 24 E SI1 cushion diamonds and compare prices.

Search Diamonds

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