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

As of September 2026, 3.00 to 4.99ct H SI2 natural round diamonds typically cost £11,451 GBP to £36,618 GBP, with a median price of £18,846 GBP. There are currently 1,100 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct H SI2 Natural Round

Quick answer

As of September 2026, there are 1,100 natural round diamonds with H colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £11,451 GBP to £36,618 GBP, with a median of £18,846 GBP. At least 47 retailers stock this exact specification. Half of all listings fall between £4,762 GBP and £8,325 GBP per carat. The same specification in lab grown form lists at a median of about £6,965 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

1,100

Lowest Price

£6,469 GBP

Highest Price

£83,148 GBP

Average Price

£21,927 GBP

Market Intelligence

Retailers Selling

Price Spread

52.8%

Price Range

Price per carat distribution across retailers

$9,123/ct

10th Percentile

$5,156

Median

$9,123

90th Percentile

$13,095

Score Distribution

1.1K diamonds scored across 4 quality tiers

Excellent

287 (26.1%)

Very Good

390 (35.5%)

Good

258 (23.5%)

Average

165 (15.0%)

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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