How much does a 5.00ct+ I SI2 natural princess diamond cost?

As of September 2026, 5.00ct+ I SI2 natural princess diamonds typically cost $40,069 AUD to $84,373 AUD, with a median price of $62,167 AUD. There are currently 9 diamonds matching this specification available across retailers.

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

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5.00ct+ I SI2 Natural Princess

Quick answer

As of September 2026, there are 9 natural princess diamonds with I colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $40,069 AUD to $84,373 AUD, with a median of $62,167 AUD. At least 17 retailers stock this exact specification. Half of all listings fall between $10,266 AUD and $17,734 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. Princess natural stones in the index: 2,073 USD per carat, -3.2% 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

$25,473 AUD

Highest Price

$116,384 AUD

Average Price

$63,415 AUD

Market Intelligence

Retailers Selling

Price Spread

49.9%

Price Range

Price per carat distribution across retailers

$10,743/ct

10th Percentile

$6,334

Median

$10,743

90th Percentile

$13,767

Score Distribution

9 diamonds scored across 3 quality tiers

Very Good

4 (44.4%)

Good

2 (22.2%)

Average

3 (33.3%)

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Consider Instead

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

J SI2J colour is visually identical to I to the naked eye

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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