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 $1,468 SGD to $4,642 SGD, with a median price of $2,433 SGD. There are currently 759 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 759 natural heart diamonds with I colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,468 SGD to $4,642 SGD, with a median of $2,433 SGD. At least 50 retailers stock this exact specification. Half of all listings fall between $1,891 SGD and $2,920 SGD per carat. The same specification in lab grown form lists at a median of about $2,483 SGD 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

759

Lowest Price

$828 SGD

Highest Price

$7,797 SGD

Average Price

$2,747 SGD

Market Intelligence

Retailers Selling

Price Spread

45.0%

Price Range

Price per carat distribution across retailers

$1,797/ct

10th Percentile

$1,271

Median

$1,797

90th Percentile

$3,063

Score Distribution

759 diamonds scored across 4 quality tiers

Excellent

91 (12.0%)

Very Good

229 (30.2%)

Good

215 (28.3%)

Average

224 (29.5%)

Find Your Diamond

Search 759 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 4%

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