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

As of September 2026, 5.00ct+ E SI2 natural cushion diamonds typically cost $78,904 AUD to $152,968 AUD, with a median price of $116,261 AUD. There are currently 20 diamonds matching this specification available across retailers.

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5.00ct+ E SI2 Natural Cushion

Quick answer

As of September 2026, there are 20 natural cushion diamonds with E colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $78,904 AUD to $152,968 AUD, with a median of $116,261 AUD. At least 19 retailers stock this exact specification. Half of all listings fall between $20,515 AUD and $27,543 AUD per carat. The same specification in lab grown form lists at a median of about $422 AUD 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

$67,685 AUD

Highest Price

$332,332 AUD

Average Price

$128,368 AUD

Market Intelligence

Retailers Selling

Price Spread

30.9%

Price Range

Price per carat distribution across retailers

$16,206/ct

10th Percentile

$12,614

Median

$16,206

90th Percentile

$21,766

Score Distribution

20 diamonds scored across 4 quality tiers

Excellent

5 (25.0%)

Very Good

10 (50.0%)

Good

3 (15.0%)

Average

2 (10.0%)

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Consider Instead

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

Lab-Grown E 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