How much does a 1.00 to 1.49ct F SI2 natural marquise diamond cost?

As of October 2026, 1.00 to 1.49ct F SI2 natural marquise diamonds typically cost £1,243 GBP to £3,893 GBP, with a median price of £2,100 GBP. There are currently 642 diamonds matching this specification available across retailers.

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

About 42% of these diamonds are available at multiple retailers, with an average price spread of 53%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct F SI2 Natural Marquise

Quick answer

As of October 2026, there are 642 natural marquise diamonds with F colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,243 GBP to £3,893 GBP, with a median of £2,100 GBP. At least 56 retailers stock this exact specification, and 42% of the stones appear at more than one of them, with an average price spread of 53%. Half of all listings fall between £1,725 GBP and £2,909 GBP per carat. Over the last 30 days the median price moved -0.4% and the number of listings moved +16.2%.

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

642

Lowest Price

£696 GBP

Highest Price

£12,184 GBP

Average Price

£2,388 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

41.8%

Price Spread

53.4%

30-Day Price Trend

-0.4%

30-Day Supply Change

+16.2%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,974/ct

10th Percentile

$1,789

Median

$2,974

90th Percentile

$4,938

Score Distribution

1.3K diamonds scored across 4 quality tiers

Excellent

330 (25.6%)

Very Good

405 (31.4%)

Good

266 (20.6%)

Average

290 (22.5%)

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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