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

As of September 2026, 5.00ct+ E SI2 natural round diamonds typically cost $69,201 AUD to $322,473 AUD, with a median price of $146,880 AUD. There are currently 119 diamonds matching this specification available across retailers.

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

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5.00ct+ E SI2 Natural Round

Quick answer

As of September 2026, there are 119 natural round diamonds with E colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $69,201 AUD to $322,473 AUD, with a median of $146,880 AUD. At least 39 retailers stock this exact specification. Half of all listings fall between $22,305 AUD and $29,665 AUD per carat. The same specification in lab grown form lists at a median of about $660 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. Round natural stones in the index: 2,094 USD per carat, -3.8% 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

119

Lowest Price

$46,580 AUD

Highest Price

$1,299,485 AUD

Average Price

$183,128 AUD

Market Intelligence

Retailers Selling

Price Spread

28.1%

Price Range

Price per carat distribution across retailers

$18,805/ct

10th Percentile

$12,124

Median

$18,805

90th Percentile

$23,494

Score Distribution

119 diamonds scored across 4 quality tiers

Excellent

38 (31.9%)

Very Good

29 (24.4%)

Good

29 (24.4%)

Average

23 (19.3%)

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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