How much does a 1.50 to 1.99ct F SI2 natural marquise diamond cost?

As of October 2026, 1.50 to 1.99ct F SI2 natural marquise diamonds typically cost £3,176 GBP to £12,386 GBP, with a median price of £6,268 GBP. There are currently 183 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 50%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct F SI2 Natural Marquise

Quick answer

As of October 2026, there are 183 natural marquise diamonds with F colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £3,176 GBP to £12,386 GBP, with a median of £6,268 GBP. At least 52 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 50%. Half of all listings fall between £3,018 GBP and £5,077 GBP per carat. Over the last 30 days the median price moved -2.1% and the number of listings moved +14.6%.

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

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Marquise natural stones in the index: 2,268 USD per carat, +10.8% month on month. See the full index release

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

Last updated: October 2026

Available

183

Lowest Price

£2,081 GBP

Highest Price

£21,125 GBP

Average Price

£7,170 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

35.9%

Price Spread

49.8%

30-Day Price Trend

-2.1%

30-Day Supply Change

+14.6%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$5,536/ct

10th Percentile

$3,065

Median

$5,536

90th Percentile

$8,596

Score Distribution

439 diamonds scored across 4 quality tiers

Excellent

85 (19.4%)

Very Good

122 (27.8%)

Good

82 (18.7%)

Average

150 (34.2%)

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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