How much does a 0.75 to 0.99ct I SI2 natural princess diamond cost?

As of October 2026, 0.75 to 0.99ct I SI2 natural princess diamonds typically cost $981 AUD to $2,749 AUD, with a median price of $1,675 AUD. There are currently 82 diamonds matching this specification available across retailers.

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

About 26% of these diamonds are available at multiple retailers, with an average price spread of 68%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct I SI2 Natural Princess

Quick answer

As of October 2026, there are 82 natural princess diamonds with I colour and SI2 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $981 AUD to $2,749 AUD, with a median of $1,675 AUD. At least 47 retailers stock this exact specification, and 26% of the stones appear at more than one of them, with an average price spread of 68%. Half of all listings fall between $1,402 AUD and $2,664 AUD per carat. The same specification in lab grown form lists at a median of about $1,931 AUD per carat. Over the last 30 days the median price moved -8.7% and the number of listings moved +16.0%.

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

$820 AUD

Highest Price

$6,008 AUD

Average Price

$1,802 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

26.1%

Price Spread

67.9%

30-Day Price Trend

-8.7%

30-Day Supply Change

+16.0%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,307/ct

10th Percentile

$875

Median

$1,307

90th Percentile

$2,678

Score Distribution

254 diamonds scored across 4 quality tiers

Excellent

22 (8.7%)

Very Good

32 (12.6%)

Good

65 (25.6%)

Average

135 (53.1%)

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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