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

As of September 2026, 3.00 to 4.99ct H SI2 natural marquise diamonds typically cost £14,431 GBP to £39,501 GBP, with a median price of £23,487 GBP. There are currently 110 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct H SI2 Natural Marquise

Quick answer

As of September 2026, there are 110 natural marquise diamonds with H colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £14,431 GBP to £39,501 GBP, with a median of £23,487 GBP. At least 42 retailers stock this exact specification. Half of all listings fall between £5,734 GBP and £9,464 GBP per carat. The same specification in lab grown form lists at a median of about £5,146 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. Marquise natural stones in the index: 2,114 USD per carat, -8.8% 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

110

Lowest Price

£12,343 GBP

Highest Price

£77,521 GBP

Average Price

£25,654 GBP

Market Intelligence

Retailers Selling

Price Spread

47.9%

Price Range

Price per carat distribution across retailers

$10,509/ct

10th Percentile

$6,304

Median

$10,509

90th Percentile

$14,413

Score Distribution

109 diamonds scored across 4 quality tiers

Excellent

11 (10.1%)

Very Good

36 (33.0%)

Good

36 (33.0%)

Average

26 (23.9%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

Lab-Grown H SI2Same specifications, lab-grown origin

Save 34%

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