How much does a 1.50 to 1.99ct F SI1 lab grown heart diamond cost?

As of October 2026, 1.50 to 1.99ct F SI1 lab grown heart diamonds typically cost £167 GBP to £743 GBP, with a median price of £350 GBP. There are currently 16 diamonds matching this specification available across retailers.

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

About 39% of these diamonds are available at multiple retailers, with an average price spread of 100%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct F SI1 Lab Grown Heart

Quick answer

As of October 2026, there are 16 lab grown heart diamonds with F colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £167 GBP to £743 GBP, with a median of £350 GBP. At least 30 retailers stock this exact specification, and 39% of the stones appear at more than one of them, with an average price spread of 100%. Half of all listings fall between £174 GBP and £442 GBP per carat. The same specification in natural form lists at a median of about £3,306 GBP per carat. Over the last 30 days the median price moved -3.5% and the number of listings moved +7.7%.

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: October 2026

Available

Lowest Price

£155 GBP

Highest Price

£1,562 GBP

Average Price

£457 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

39.2%

Price Spread

100.4%

30-Day Price Trend

-3.5%

30-Day Supply Change

+7.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$356/ct

10th Percentile

$170

Median

$356

90th Percentile

$919

Score Distribution

42 diamonds scored across 4 quality tiers

Excellent

15 (35.7%)

Very Good

4 (9.5%)

Good

7 (16.7%)

Average

16 (38.1%)

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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