How much does a 1.50 to 1.99ct H SI2 lab grown round diamond cost?

As of October 2026, 1.50 to 1.99ct H SI2 lab grown round diamonds typically cost £826 GBP to £4,132 GBP, with a median price of £1,454 GBP. There are currently 41 diamonds matching this specification available across retailers.

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

About 45% of these diamonds are available at multiple retailers, with an average price spread of 87%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct H SI2 Lab Grown Round

Quick answer

As of October 2026, there are 41 lab grown round diamonds with H colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £826 GBP to £4,132 GBP, with a median of £1,454 GBP. At least 31 retailers stock this exact specification, and 45% of the stones appear at more than one of them, with an average price spread of 87%. Half of all listings fall between £668 GBP and £1,290 GBP per carat. The same specification in natural form lists at a median of about £2,814 GBP per carat. Over the last 30 days the median price moved -8.1% and the number of listings moved +9.7%.

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. Round lab grown stones in the index: 414 USD per carat, -5.0% 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

£406 GBP

Highest Price

£5,497 GBP

Average Price

£2,132 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

44.9%

Price Spread

87.3%

30-Day Price Trend

-8.1%

30-Day Supply Change

+9.7%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$949/ct

10th Percentile

$724

Median

$949

90th Percentile

$2,706

Score Distribution

89 diamonds scored across 4 quality tiers

Excellent

22 (24.7%)

Very Good

3 (3.4%)

Good

22 (24.7%)

Average

42 (47.2%)

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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