How much does a 3.00 to 4.99ct I SI2 natural oval diamond cost?

As of September 2026, 3.00 to 4.99ct I SI2 natural oval diamonds typically cost £11,232 GBP to £38,273 GBP, with a median price of £21,549 GBP. There are currently 698 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct I SI2 Natural Oval

Quick answer

As of September 2026, there are 698 natural oval diamonds with I colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £11,232 GBP to £38,273 GBP, with a median of £21,549 GBP. At least 48 retailers stock this exact specification. Half of all listings fall between £4,831 GBP and £8,727 GBP per carat. The same specification in lab grown form lists at a median of about £11,129 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

698

Lowest Price

£5,430 GBP

Highest Price

£123,575 GBP

Average Price

£23,385 GBP

Market Intelligence

Retailers Selling

Price Spread

55.4%

Price Range

Price per carat distribution across retailers

$8,937/ct

10th Percentile

$4,868

Median

$8,937

90th Percentile

$12,687

Score Distribution

698 diamonds scored across 5 quality tiers

Exceptional

1 (0.1%)

Excellent

96 (13.8%)

Very Good

275 (39.4%)

Good

181 (25.9%)

Average

145 (20.8%)

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Consider Instead

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J SI2J colour is visually identical to I to the naked eye

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1