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 $1,197 USD to $3,648 USD, with a median price of $1,933 USD. There are currently 755 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct I SI2 Natural Heart

Quick answer

As of September 2026, there are 755 natural heart diamonds with I color and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,197 USD to $3,648 USD, with a median of $1,933 USD. At least 49 retailers stock this exact specification. Half of all listings fall between $1,486 USD and $2,315 USD per carat. The same specification in lab grown form lists at a median of about $1,904 USD 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

755

Lowest Price

$615 USD

Highest Price

$6,127 USD

Average Price

$2,175 USD

Market Intelligence

Retailers Selling

Price Spread

46.0%

Price Range

Price per carat distribution across retailers

$1,803/ct

10th Percentile

$1,280

Median

$1,803

90th Percentile

$3,094

Score Distribution

755 diamonds scored across 4 quality tiers

Excellent

80 (10.6%)

Very Good

236 (31.3%)

Good

215 (28.5%)

Average

224 (29.7%)

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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 7%

Lab-Grown I SI2Same specifications, lab-grown origin

Save 11%

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