How much does a 1.00 to 1.49ct I SI1 lab grown heart diamond cost?

As of November 2026, 1.00 to 1.49ct I SI1 lab grown heart diamonds typically cost €555 EUR to €1,611 EUR, with a median price of €1,405 EUR. There are currently 9 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI1 heart diamond?

About 35% 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 SI1 Lab Grown Heart

Quick answer

As of November 2026, there are 9 lab grown heart diamonds with I colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run €555 EUR to €1,611 EUR, with a median of €1,405 EUR. At least 15 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 60%. Half of all listings fall between €967 EUR and €1,647 EUR per carat. The same specification in natural form lists at a median of about €2,187 EUR per carat. Over the last 30 days the median price moved -5.8% and the number of listings moved -1.7%.

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 lab grown stones in the index: 421 USD per carat, -1.8% 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

Lowest Price

€546 EUR

Highest Price

€3,734 EUR

Average Price

€1,137 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

34.8%

Price Spread

60.4%

30-Day Price Trend

-5.8%

30-Day Supply Change

-1.7%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,258/ct

10th Percentile

$617

Median

$1,258

90th Percentile

$2,408

Score Distribution

17 diamonds scored across 3 quality tiers

Excellent

7 (41.2%)

Good

3 (17.6%)

Average

7 (41.2%)

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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