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

As of October 2026, 3.00 to 4.99ct G SI1 natural princess diamonds typically cost £20,626 GBP to £42,872 GBP, with a median price of £30,762 GBP. There are currently 31 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 37%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct G SI1 Natural Princess

Quick answer

As of October 2026, there are 31 natural princess diamonds with G colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £20,626 GBP to £42,872 GBP, with a median of £30,762 GBP. At least 53 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 37%. Half of all listings fall between £7,082 GBP and £10,138 GBP per carat. The same specification in lab grown form lists at a median of about £273 GBP per carat. Over the last 30 days the median price moved -0.8% and the number of listings moved +10.8%.

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

Lowest Price

£12,216 GBP

Highest Price

£62,712 GBP

Average Price

£31,276 GBP