How much does a 3.00 to 4.99ct I SI1 natural princess diamond cost?

As of November 2026, 3.00 to 4.99ct I SI1 natural princess diamonds typically cost €15,959 EUR to €39,923 EUR, with a median price of €27,185 EUR. There are currently 43 diamonds matching this specification available across retailers.

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

About 35% of these diamonds are available at multiple retailers, with an average price spread of 33%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I SI1 Natural Princess

Quick answer

As of November 2026, there are 43 natural princess diamonds with I color and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run €15,959 EUR to €39,923 EUR, with a median of €27,185 EUR. At least 52 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 33%. Half of all listings fall between €6,867 EUR and €9,522 EUR per carat. The same specification in lab grown form lists at a median of about €400 EUR per carat. Over the last 30 days the median price moved -1.0% and the number of listings moved +4.4%.

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: November 2026

Available

Lowest Price

€9,284 EUR

Highest Price

€66,205 EUR

Average Price

€27,575 EUR