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

As of November 6, 2026, 1.50 to 1.99ct K SI1 natural princess diamonds typically cost €1,913 EUR to €4,392 EUR, with a median price of €2,673 EUR. There are currently 135 diamonds matching this specification available across retailers.

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

About 50% of these diamonds are available at multiple retailers, with an average price spread of 41%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct K SI1 Natural Princess

Quick answer

As of November 6, 2026, there are 135 natural princess diamonds with K colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run €1,913 EUR to €4,392 EUR, with a median of €2,673 EUR. Half of all listings fall between €1,366 EUR and €2,044 EUR per carat. The same specification in lab grown form lists at a median of about €539 EUR per carat. Over the last 30 days the median price moved -1.9% and the number of listings moved +17.4%.

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

135

Lowest Price

€1,597 EUR

Highest Price

€11,146 EUR

Average Price

€2,954 EUR

Market Intelligence

Cross Retailer %

49.6%

Price Spread

40.7%

30-Day Price Trend

-1.9%

30-Day Supply Change

+17.4%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,870/ct

10th Percentile

$1,406

Median

$1,870

90th Percentile

$3,127

Score Distribution

135 diamonds scored across 4 quality tiers

Excellent

35 (25.9%)

Very Good

45 (33.3%)

Good

28 (20.7%)

Average

27 (20.0%)

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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