How much does a 2.00 to 2.99ct I SI2 lab grown marquise diamond cost?

As of September 2026, 2.00 to 2.99ct I SI2 lab grown marquise diamonds typically cost £3,485 GBP to £13,061 GBP, with a median price of £6,761 GBP. There are currently 9 diamonds matching this specification available across retailers.

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

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2.00 to 2.99ct I SI2 Lab Grown Marquise

Quick answer

As of September 2026, there are 9 lab grown marquise diamonds with I colour and SI2 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £3,485 GBP to £13,061 GBP, with a median of £6,761 GBP. At least 9 retailers stock this exact specification. Half of all listings fall between £1,845 GBP and £6,906 GBP per carat. The same specification in natural form lists at a median of about £6,413 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

£3,462 GBP

Highest Price

£14,310 GBP

Average Price

£7,863 GBP

Market Intelligence

Retailers Selling

Price Spread

151.2%

Price Range

Price per carat distribution across retailers

$4,521/ct

10th Percentile

$2,261

Median

$4,521

90th Percentile

$9,575

Score Distribution

9 diamonds scored across 3 quality tiers

Very Good

2 (22.2%)

Good

1 (11.1%)

Average

6 (66.7%)

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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