How much does a 1.00 to 1.49ct F SI1 natural marquise diamond cost?

As of November 2026, 1.00 to 1.49ct F SI1 natural marquise diamonds typically cost £2,136 GBP to £5,333 GBP, with a median price of £3,018 GBP. There are currently 288 diamonds matching this specification available across retailers.

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

About 35% of these diamonds are available at multiple retailers, with an average price spread of 39%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct F SI1 Natural Marquise

Quick answer

As of November 2026, there are 288 natural marquise diamonds with F colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £2,136 GBP to £5,333 GBP, with a median of £3,018 GBP. At least 64 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 39%. Half of all listings fall between £2,474 GBP and £3,613 GBP per carat. The same specification in lab grown form lists at a median of about £303 GBP per carat. Over the last 30 days the median price moved +0.1% and the number of listings moved +14.4%.

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: November 2026

Available

288

Lowest Price

£1,433 GBP

Highest Price

£12,464 GBP

Average Price

£3,494 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

35.1%

Price Spread

39.3%

30-Day Price Trend

+0.1%

30-Day Supply Change

+14.4%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$3,885/ct

10th Percentile

$2,915

Median

$3,885

90th Percentile

$5,958

Score Distribution

650 diamonds scored across 4 quality tiers

Excellent

58 (8.9%)

Very Good

147 (22.6%)

Good

169 (26.0%)

Average

276 (42.5%)

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Consider Instead

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

F SI2SI2 inclusions are not visible without magnification

Save 23%

Lab-Grown F SI1Same specifications, lab-grown origin

Save 89%

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