How much does a 3.00 to 4.99ct G SI1 natural oval diamond cost?

As of September 2026, 3.00 to 4.99ct G SI1 natural oval diamonds typically cost £18,818 GBP to £59,696 GBP, with a median price of £34,646 GBP. There are currently 395 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI1 oval diamond?

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3.00 to 4.99ct G SI1 Natural Oval

Quick answer

As of September 2026, there are 395 natural oval diamonds with G colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £18,818 GBP to £59,696 GBP, with a median of £34,646 GBP. At least 50 retailers stock this exact specification. Half of all listings fall between £9,705 GBP and £12,733 GBP per carat. The same specification in lab grown form lists at a median of about £255 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. Oval natural stones in the index: 2,380 USD per carat, -9.6% 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

395

Lowest Price

£9,657 GBP

Highest Price

£118,566 GBP

Average Price

£37,683 GBP