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

As of September 2026, 1.00 to 1.49ct H SI2 lab grown marquise diamonds typically cost £1,575 GBP to £3,623 GBP, with a median price of £2,520 GBP. There are currently 11 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

1.00 to 1.49ct H SI2 Lab Grown Marquise

Quick answer

As of September 2026, there are 11 lab grown marquise diamonds with H colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,575 GBP to £3,623 GBP, with a median of £2,520 GBP. At least 7 retailers stock this exact specification. Half of all listings fall between £1,225 GBP and £2,209 GBP per carat. The same specification in natural form lists at a median of about £2,367 GBP per carat.

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. Marquise lab grown stones in the index: 500 USD per carat, -14.7% 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

Lowest Price

£1,404 GBP

Highest Price

£4,298 GBP

Average Price

£2,549 GBP

Market Intelligence

Retailers Selling

Price Spread

62.7%

Price Range

Price per carat distribution across retailers

$1,993/ct

10th Percentile

$1,103

Median

$1,993

90th Percentile

$3,827

Score Distribution

11 diamonds scored across 2 quality tiers

Good

1 (9.1%)

Average

10 (90.9%)

Find Your Diamond

Search 11 H SI2 marquise diamonds and compare prices.

Search Diamonds

Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

H I1I1 inclusions are not visible without magnification

Save 6%

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