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 $16,994 NZD to $85,699 NZD, with a median price of $39,495 NZD. 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 $16,994 NZD to $85,699 NZD, with a median of $39,495 NZD. At least 20 retailers stock this exact specification. Half of all listings fall between $6,914 NZD and $9,235 NZD per carat. The same specification in lab grown form lists at a median of about $2,102 NZD 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

$13,184 NZD

Highest Price

$305,705 NZD

Average Price

$46,544 NZD

Market Intelligence

Retailers Selling

Price Spread

28.2%

Price Range

Price per carat distribution across retailers

$4,738/ct

10th Percentile

$3,599

Median

$4,738

90th Percentile

$6,013

Score Distribution

160 diamonds scored across 4 quality tiers

Excellent

23 (14.4%)

Very Good

51 (31.9%)

Good

48 (30.0%)

Average

38 (23.8%)

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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 34%

Lab-Grown I SI2Same specifications, lab-grown origin

Save 74%

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