How much does a 5.00ct+ J SI1 natural princess diamond cost?

As of October 2026, 5.00ct+ J SI1 natural princess diamonds typically cost $66,244 AUD to $119,858 AUD, with a median price of $88,948 AUD. There are currently 12 diamonds matching this specification available across retailers.

Where can I find the best price on a J SI1 princess diamond?

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5.00ct+ J SI1 Natural Princess

Quick answer

As of October 2026, there are 12 natural princess diamonds with J colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $66,244 AUD to $119,858 AUD, with a median of $88,948 AUD.

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. Princess natural stones in the index: 2,158 USD per carat, +5.7% 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

$55,475 AUD

Highest Price

$408,754 AUD

Average Price

$109,761 AUD

Score Distribution

27 diamonds scored across 4 quality tiers

Excellent

2 (7.4%)

Very Good

10 (37.0%)

Good

6 (22.2%)

Average

9 (33.3%)

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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