How much does a 1.00 to 1.49ct H SI2 lab grown round diamond cost?

As of September 2026, 1.00 to 1.49ct H SI2 lab grown round diamonds typically cost £429 GBP to £4,545 GBP, with a median price of £1,600 GBP. There are currently 191 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct H SI2 Lab Grown Round

Quick answer

As of September 2026, there are 191 lab grown round diamonds with H colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £429 GBP to £4,545 GBP, with a median of £1,600 GBP. At least 25 retailers stock this exact specification. Half of all listings fall between £1,931 GBP and £3,005 GBP per carat. The same specification in natural form lists at a median of about £1,880 GBP per carat.

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

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Round lab grown stones in the index: 438 USD per carat, -14.1% month on month. See the full index release

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

Last updated: September 2026

Available

191

Lowest Price

£119 GBP

Highest Price

£7,362 GBP

Average Price

£2,037 GBP

Market Intelligence

Retailers Selling

Price Spread

43.0%

Price Range

Price per carat distribution across retailers

$3,370/ct

10th Percentile

$1,882

Median

$3,370

90th Percentile

$4,977

Score Distribution

191 diamonds scored across 4 quality tiers

Excellent

16 (8.4%)

Very Good

72 (37.7%)

Good

36 (18.8%)

Average

67 (35.1%)

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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