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

As of September 2026, 3.00 to 4.99ct I SI2 natural heart diamonds typically cost £7,263 GBP to £36,712 GBP, with a median price of £16,322 GBP. There are currently 160 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct I SI2 Natural Heart

Quick answer

As of September 2026, there are 160 natural heart diamonds with I colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £7,263 GBP to £36,712 GBP, with a median of £16,322 GBP. At least 20 retailers stock this exact specification. Half of all listings fall between £2,714 GBP and £3,795 GBP per carat. The same specification in lab grown form lists at a median of about £898 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. Heart natural stones in the index: 2,261 USD per carat, +1.7% 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

160

Lowest Price

£5,634 GBP

Highest Price

£130,649 GBP

Average Price

£19,741 GBP

Market Intelligence

Retailers Selling

Price Spread

34.9%

Price Range

Price per carat distribution across retailers

$4,179/ct

10th Percentile

$3,239

Median

$4,179

90th Percentile

$6,818

Score Distribution

160 diamonds scored across 4 quality tiers

Excellent

24 (15.0%)

Very Good

50 (31.3%)

Good

50 (31.3%)

Average

36 (22.5%)

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Consider Instead

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

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

Save 25%

Lab-Grown I SI2Same specifications, lab-grown origin

Save 71%

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