How much does a 1.00 to 1.49ct H SI1 natural princess diamond cost?

As of October 2026, 1.00 to 1.49ct H SI1 natural princess diamonds typically cost $2,320 AUD to $6,579 AUD, with a median price of $3,630 AUD. There are currently 318 diamonds matching this specification available across retailers.

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

About 37% of these diamonds are available at multiple retailers, with an average price spread of 56%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct H SI1 Natural Princess

Quick answer

As of October 2026, there are 318 natural princess diamonds with H colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,320 AUD to $6,579 AUD, with a median of $3,630 AUD. At least 60 retailers stock this exact specification, and 37% of the stones appear at more than one of them, with an average price spread of 56%. Half of all listings fall between $2,554 AUD and $4,275 AUD per carat. The same specification in lab grown form lists at a median of about $1,073 AUD per carat. Over the last 30 days the median price moved -1.4% and the number of listings moved +6.8%.

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

318

Lowest Price

$1,302 AUD

Highest Price

$13,511 AUD

Average Price

$4,065 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

37.2%

Price Spread

56.0%

30-Day Price Trend

-1.4%

30-Day Supply Change

+6.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$2,158/ct

10th Percentile

$1,529

Median

$2,158

90th Percentile

$4,155

Score Distribution

841 diamonds scored across 4 quality tiers

Excellent

131 (15.6%)

Very Good

172 (20.5%)

Good

139 (16.5%)

Average

399 (47.4%)

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Consider Instead

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

H SI2SI2 inclusions are not visible without magnification

Save 7%

Lab-Grown H SI1Same specifications, lab-grown origin

Save 60%

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