How much does a 0.20 to 0.49ct I SI1 natural princess diamond cost?

As of October 2026, 0.20 to 0.49ct I SI1 natural princess diamonds typically cost $248 USD to $506 USD, with a median price of $344 USD. There are currently 105 diamonds matching this specification available across retailers.

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

About 47% of these diamonds are available at multiple retailers, with an average price spread of 42%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct I SI1 Natural Princess

Quick answer

As of October 2026, there are 105 natural princess diamonds with I color and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $248 USD to $506 USD, with a median of $344 USD. At least 14 retailers stock this exact specification, and 47% of the stones appear at more than one of them, with an average price spread of 42%. Half of all listings fall between $926 USD and $1,425 USD per carat. Over the last 30 days the median price moved -0.4% and the number of listings moved -18.7%.

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

105

Lowest Price

$140 USD

Highest Price

$1,023 USD

Average Price

$368 USD

Market Intelligence

Retailers Selling

Cross Retailer %

47.4%

Price Spread

42.0%

30-Day Price Trend

-0.4%

30-Day Supply Change

-18.7%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$1,188/ct

10th Percentile

$857

Median

$1,188

90th Percentile

$1,520

Score Distribution

244 diamonds scored across 4 quality tiers

Excellent

8 (3.3%)

Very Good

78 (32.0%)

Good

33 (13.5%)

Average

125 (51.2%)

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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