How much does a 2.00 to 2.99ct G SI2 natural marquise diamond cost?

As of September 2026, 2.00 to 2.99ct G SI2 natural marquise diamonds typically cost £6,122 GBP to £18,332 GBP, with a median price of £11,611 GBP. There are currently 378 diamonds matching this specification available across retailers.

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

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2.00 to 2.99ct G SI2 Natural Marquise

Quick answer

As of September 2026, there are 378 natural marquise diamonds with G colour and SI2 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £6,122 GBP to £18,332 GBP, with a median of £11,611 GBP. At least 47 retailers stock this exact specification. Half of all listings fall between £4,370 GBP and £7,209 GBP per carat. The same specification in lab grown form lists at a median of about £8,064 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. Marquise natural stones in the index: 2,114 USD per carat, -8.8% 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

378

Lowest Price

£3,160 GBP

Highest Price

£50,669 GBP

Average Price

£11,970 GBP

Market Intelligence

Retailers Selling

Price Spread

47.1%

Price Range

Price per carat distribution across retailers

$8,109/ct

10th Percentile

$4,636

Median

$8,109

90th Percentile

$11,040

Score Distribution

378 diamonds scored across 4 quality tiers

Excellent

65 (17.2%)

Very Good

132 (34.9%)

Good

117 (31.0%)

Average

64 (16.9%)

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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