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

As of November 6, 2026, 1.00 to 1.49ct I SI1 natural princess diamonds typically cost €1,341 EUR to €3,664 EUR, with a median price of €2,119 EUR. There are currently 712 diamonds matching this specification available across retailers.

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

About 33% of these diamonds are available at multiple retailers, with an average price spread of 51%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct I SI1 Natural Princess

Quick answer

As of November 6, 2026, there are 712 natural princess diamonds with I colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run €1,341 EUR to €3,664 EUR, with a median of €2,119 EUR. Half of all listings fall between €1,536 EUR and €2,533 EUR per carat. The same specification in lab grown form lists at a median of about €1,214 EUR per carat. Over the last 30 days the median price moved -1.3% and the number of listings moved +11.5%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Princess natural stones in the index: 1,991 USD per carat, -8.2% month on month. See the full index release

Figures come from current listings across more than 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

712

Lowest Price

€873 EUR

Highest Price

€6,619 EUR

Average Price

€2,314 EUR

Market Intelligence

Cross Retailer %

33.1%

Price Spread

51.3%

30-Day Price Trend

-1.3%

30-Day Supply Change

+11.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,179/ct

10th Percentile

$1,416

Median

$2,179

90th Percentile

$3,415

Score Distribution

712 diamonds scored across 4 quality tiers

Excellent

116 (16.3%)

Very Good

143 (20.1%)

Good

134 (18.8%)

Average

319 (44.8%)

Find Your Diamond

Search 712 I 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.

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