How much does a 1.50 to 1.99ct F SI1 natural princess diamond cost?

As of October 2026, 1.50 to 1.99ct F SI1 natural princess diamonds typically cost $6,026 AUD to $22,174 AUD, with a median price of $12,221 AUD. There are currently 160 diamonds matching this specification available across retailers.

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

About 33% of these diamonds are available at multiple retailers, with an average price spread of 64%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct F SI1 Natural Princess

Quick answer

As of October 2026, there are 160 natural princess diamonds with F colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $6,026 AUD to $22,174 AUD, with a median of $12,221 AUD. At least 58 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 64%. Half of all listings fall between $5,239 AUD and $9,861 AUD per carat. The same specification in lab grown form lists at a median of about $518 AUD per carat. Over the last 30 days the median price moved -2.7% and the number of listings moved +10.6%.

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

160

Lowest Price

$2,119 AUD

Highest Price

$33,019 AUD

Average Price

$13,237 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

32.7%

Price Spread

64.3%

30-Day Price Trend

-2.7%

30-Day Supply Change

+10.6%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$5,056/ct

10th Percentile

$3,021

Median

$5,056

90th Percentile

$8,569

Score Distribution

389 diamonds scored across 4 quality tiers

Excellent

61 (15.7%)

Very Good

72 (18.5%)

Good

97 (24.9%)

Average

159 (40.9%)

Find Your Diamond

Search 160 F SI1 princess diamonds and compare prices.

Search Diamonds

Consider Instead

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

F SI2SI2 inclusions are not visible without magnification

Save 31%

Lab-Grown F SI1Same specifications, lab-grown origin

Save 93%

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