How much does a 1.00 to 1.49ct I SI2 natural heart diamond cost?

As of September 2026, 1.00 to 1.49ct I SI2 natural heart diamonds typically cost $1,914 NZD to $6,079 NZD, with a median price of $3,212 NZD. There are currently 763 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

1.00 to 1.49ct I SI2 Natural Heart

Quick answer

As of September 2026, there are 763 natural heart diamonds with I colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,914 NZD to $6,079 NZD, with a median of $3,212 NZD. At least 50 retailers stock this exact specification. Half of all listings fall between $2,461 NZD and $3,820 NZD per carat. The same specification in lab grown form lists at a median of about $3,397 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

763

Lowest Price

$1,085 NZD

Highest Price

$10,212 NZD

Average Price

$3,600 NZD

Market Intelligence

Retailers Selling

Price Spread

45.6%

Price Range

Price per carat distribution across retailers

$1,787/ct

10th Percentile

$1,259

Median

$1,787

90th Percentile

$3,056

Score Distribution

763 diamonds scored across 4 quality tiers

Excellent

86 (11.3%)

Very Good

230 (30.1%)

Good

220 (28.8%)

Average

227 (29.8%)

Find Your Diamond

Search 763 I SI2 heart diamonds and compare prices.

Search Diamonds

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 7%

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