How much does a 2.00 to 2.99ct I SI2 natural round diamond cost?

As of September 2026, 2.00 to 2.99ct I SI2 natural round diamonds typically cost £4,623 GBP to £13,952 GBP, with a median price of £8,259 GBP. There are currently 3,403 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

2.00 to 2.99ct I SI2 Natural Round

Quick answer

As of September 2026, there are 3,403 natural round diamonds with I colour and SI2 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £4,623 GBP to £13,952 GBP, with a median of £8,259 GBP. At least 53 retailers stock this exact specification. Half of all listings fall between £3,222 GBP and £5,241 GBP per carat. The same specification in lab grown form lists at a median of about £1,581 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

3,403

Lowest Price

£1,481 GBP

Highest Price

£38,507 GBP

Average Price

£8,960 GBP