How much does a 3.00 to 4.99ct G SI2 natural round diamond cost?

As of September 2026, 3.00 to 4.99ct G SI2 natural round diamonds typically cost £13,269 GBP to £46,109 GBP, with a median price of £24,272 GBP. There are currently 791 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI2 round diamond?

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3.00 to 4.99ct G SI2 Natural Round

Quick answer

As of September 2026, there are 791 natural round diamonds with G colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £13,269 GBP to £46,109 GBP, with a median of £24,272 GBP. At least 49 retailers stock this exact specification. Half of all listings fall between £6,552 GBP and £10,983 GBP per carat. The same specification in lab grown form lists at a median of about £269 GBP per carat.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Round natural stones in the index: 2,094 USD per carat, -3.8% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

791

Lowest Price

£7,520 GBP

Highest Price

£114,470 GBP

Average Price

£27,019 GBP