How much does a 3.00 to 4.99ct E SI1 natural round diamond cost?

As of October 2026, 3.00 to 4.99ct E SI1 natural round diamonds typically cost £28,772 GBP to £87,753 GBP, with a median price of £45,957 GBP. There are currently 149 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 31%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct E SI1 Natural Round

Quick answer

As of October 2026, there are 149 natural round diamonds with E colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £28,772 GBP to £87,753 GBP, with a median of £45,957 GBP. At least 57 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 31%. Half of all listings fall between £10,935 GBP and £14,797 GBP per carat. The same specification in lab grown form lists at a median of about £267 GBP per carat. Over the last 30 days the median price moved +0.5% and the number of listings moved +9.1%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

149

Lowest Price

£17,467 GBP

Highest Price

£133,857 GBP

Average Price

£52,166 GBP