How much does a 5.00ct+ G SI2 natural round diamond cost?

As of September 2026, 5.00ct+ G SI2 natural round diamonds typically cost £32,480 GBP to £135,461 GBP, with a median price of £61,826 GBP. There are currently 208 diamonds matching this specification available across retailers.

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

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

5.00ct+ G SI2 Natural Round

Quick answer

As of September 2026, there are 208 natural round diamonds with G colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £32,480 GBP to £135,461 GBP, with a median of £61,826 GBP. At least 8 retailers stock this exact specification. Half of all listings fall between £13,885 GBP and £17,418 GBP per carat. The same specification in lab grown form lists at a median of about £214 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

208

Lowest Price

£21,001 GBP

Highest Price

£272,393 GBP

Average Price

£73,839 GBP