How much does a 3.00 to 4.99ct F SI2 natural marquise diamond cost?

As of October 2026, 3.00 to 4.99ct F SI2 natural marquise diamonds typically cost £24,273 GBP to £48,859 GBP, with a median price of £32,191 GBP. There are currently 29 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 33%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct F SI2 Natural Marquise

Quick answer

As of October 2026, there are 29 natural marquise diamonds with F colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £24,273 GBP to £48,859 GBP, with a median of £32,191 GBP. At least 50 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 33%. Half of all listings fall between £8,114 GBP and £11,469 GBP per carat. The same specification in lab grown form lists at a median of about £320 GBP per carat. Over the last 30 days the median price moved -1.7% and the number of listings moved +33.9%.

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

Lowest Price

£12,300 GBP

Highest Price

£101,111 GBP

Average Price

£34,816 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

38.5%

Price Spread

32.9%

30-Day Price Trend

-1.7%

30-Day Supply Change

+33.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$13,683/ct

10th Percentile

$8,003

Median

$13,683

90th Percentile

$16,958

Score Distribution

62 diamonds scored across 4 quality tiers

Excellent

15 (24.2%)

Very Good

16 (25.8%)

Good

13 (21.0%)

Average

18 (29.0%)

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Consider Instead

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

F I1I1 inclusions are not visible without magnification

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Lab-Grown F SI2Same specifications, lab-grown origin

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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