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

As of October 2026, 0.20 to 0.49ct E SI1 natural princess diamonds typically cost £245 GBP to £627 GBP, with a median price of £389 GBP. There are currently 458 diamonds matching this specification available across retailers.

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

About 78% of these diamonds are available at multiple retailers, with an average price spread of 47%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct E SI1 Natural Princess

Quick answer

As of October 2026, there are 458 natural princess diamonds with E colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £245 GBP to £627 GBP, with a median of £389 GBP. At least 21 retailers stock this exact specification, and 78% of the stones appear at more than one of them, with an average price spread of 47%. Half of all listings fall between £727 GBP and £1,112 GBP per carat. The same specification in lab grown form lists at a median of about £500 GBP per carat. Over the last 30 days the median price moved -16.3% and the number of listings moved +188.9%.

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

458

Lowest Price

£119 GBP

Highest Price

£1,428 GBP

Average Price

£403 GBP