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

As of October 2026, 1.50 to 1.99ct D SI1 lab grown heart diamonds typically cost £164 GBP to £1,313 GBP, with a median price of £571 GBP. There are currently 26 diamonds matching this specification available across retailers.

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

About 42% of these diamonds are available at multiple retailers, with an average price spread of 105%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D SI1 Lab Grown Heart

Quick answer

As of October 2026, there are 26 lab grown heart diamonds with D colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £164 GBP to £1,313 GBP, with a median of £571 GBP. At least 35 retailers stock this exact specification, and 42% of the stones appear at more than one of them, with an average price spread of 105%. Half of all listings fall between £162 GBP and £431 GBP per carat. The same specification in natural form lists at a median of about £3,656 GBP per carat. Over the last 30 days the median price moved -12.0% and the number of listings moved +28.9%.

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

£1,922 GBP

Average Price

£649 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

42.4%

Price Spread

105.5%

30-Day Price Trend

-12.0%

30-Day Supply Change

+28.9%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$339/ct

10th Percentile

$159

Median

$339

90th Percentile

$805

Score Distribution

45 diamonds scored across 4 quality tiers

Excellent

11 (24.4%)

Very Good

8 (17.8%)

Good

9 (20.0%)

Average

17 (37.8%)

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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