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 $30,048 USD to $57,647 USD, with a median price of $44,863 USD. There are currently 10 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 10 natural princess diamonds with I color and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $30,048 USD to $57,647 USD, with a median of $44,863 USD. At least 16 retailers stock this exact specification. Half of all listings fall between $7,352 USD and $12,807 USD 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

$18,271 USD

Highest Price

$83,478 USD

Average Price

$45,450 USD

Market Intelligence

Retailers Selling

Price Spread

56.4%

Price Range

Price per carat distribution across retailers

$9,681/ct

10th Percentile

$6,234

Median

$9,681

90th Percentile

$13,812

Score Distribution

10 diamonds scored across 3 quality tiers

Very Good

4 (40.0%)

Good

3 (30.0%)

Average

3 (30.0%)

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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