How much does a 2.00 to 2.99ct H SI1 natural marquise diamond cost?

As of November 6, 2026, 2.00 to 2.99ct H SI1 natural marquise diamonds typically cost £9,997 GBP to £31,998 GBP, with a median price of £14,896 GBP. There are currently 164 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI1 marquise diamond?

About 34% of these diamonds are available at multiple retailers, with an average price spread of 48%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct H SI1 Natural Marquise

Quick answer

As of November 6, 2026, there are 164 natural marquise diamonds with H colour and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £9,997 GBP to £31,998 GBP, with a median of £14,896 GBP. Half of all listings fall between £6,224 GBP and £9,742 GBP per carat. The same specification in lab grown form lists at a median of about £525 GBP per carat. Over the last 30 days the median price moved -2.5% and the number of listings moved +26.5%.

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

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Marquise natural stones in the index: 2,177 USD per carat, -4.2% month on month. See the full index release

Figures come from current listings across more than 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

164

Lowest Price

£6,318 GBP

Highest Price

£47,323 GBP

Average Price

£17,845 GBP

Market Intelligence

Cross Retailer %

34.1%

Price Spread

47.7%

30-Day Price Trend

-2.5%

30-Day Supply Change

+26.5%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$9,931/ct

10th Percentile

$6,480

Median

$9,931

90th Percentile

$18,193

Score Distribution

164 diamonds scored across 4 quality tiers

Excellent

6 (3.7%)

Very Good

41 (25.0%)

Good

47 (28.7%)

Average

70 (42.7%)

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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