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 $107,933 SGD to $430,337 SGD, with a median price of $168,152 SGD. There are currently 21 diamonds matching this specification available across retailers.

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

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5.00ct+ E SI1 Natural Cushion

Quick answer

As of October 2026, there are 21 natural cushion diamonds with E colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $107,933 SGD to $430,337 SGD, with a median of $168,152 SGD. The same specification in lab grown form lists at a median of about $473 SGD 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

$77,903 SGD

Highest Price

$810,328 SGD

Average Price

$216,000 SGD

Score Distribution

48 diamonds scored across 4 quality tiers

Excellent

9 (18.8%)

Very Good

3 (6.3%)

Good

18 (37.5%)

Average

18 (37.5%)

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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