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

As of November 2026, 1.00 to 1.49ct I SI2 natural heart diamonds typically cost €1,101 EUR to €3,312 EUR, with a median price of €1,929 EUR. There are currently 317 diamonds matching this specification available across retailers.

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

About 43% of these diamonds are available at multiple retailers, with an average price spread of 60%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct I SI2 Natural Heart

Quick answer

As of November 2026, there are 317 natural heart diamonds with I color and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run €1,101 EUR to €3,312 EUR, with a median of €1,929 EUR. At least 57 retailers stock this exact specification, and 43% of the stones appear at more than one of them, with an average price spread of 60%. Half of all listings fall between €1,353 EUR and €2,359 EUR per carat. The same specification in lab grown form lists at a median of about €1,712 EUR per carat. Over the last 30 days the median price moved -1.5% and the number of listings moved +13.0%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Heart natural stones in the index: 2,374 USD per carat, +9.8% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: November 2026

Available

317

Lowest Price

€636 EUR

Highest Price

€6,755 EUR

Average Price

€2,057 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

42.9%

Price Spread

60.0%

30-Day Price Trend

-1.5%

30-Day Supply Change

+13.0%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,873/ct

10th Percentile

$1,238

Median

$1,873

90th Percentile

$3,801

Score Distribution

770 diamonds scored across 4 quality tiers

Excellent

146 (19.0%)

Very Good

124 (16.1%)

Good

178 (23.1%)

Average

322 (41.8%)

Find Your Diamond

Search 317 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 13%

Lab-Grown I SI2Same specifications, lab-grown origin

Save 13%

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