How much does a 0.50 to 0.74ct F SI2 natural marquise diamond cost?

As of October 2026, 0.50 to 0.74ct F SI2 natural marquise diamonds typically cost £391 GBP to £1,112 GBP, with a median price of £611 GBP. There are currently 408 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 40%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct F SI2 Natural Marquise

Quick answer

As of October 2026, there are 408 natural marquise diamonds with F colour and SI2 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run £391 GBP to £1,112 GBP, with a median of £611 GBP. At least 55 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 40%. Half of all listings fall between £924 GBP and £1,367 GBP per carat. The same specification in lab grown form lists at a median of about £408 GBP per carat. Over the last 30 days the median price moved -1.7% and the number of listings moved +6.7%.

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

408

Lowest Price

£195 GBP

Highest Price

£2,255 GBP

Average Price

£701 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

30.5%

Price Spread

39.7%

30-Day Price Trend

-1.7%

30-Day Supply Change

+6.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,486/ct

10th Percentile

$1,069

Median

$1,486

90th Percentile

$2,460

Score Distribution

1.0K diamonds scored across 4 quality tiers

Excellent

143 (14.3%)

Very Good

314 (31.4%)

Good

272 (27.2%)

Average

271 (27.1%)

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Consider Instead

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

Lab-Grown F SI2Same specifications, lab-grown origin

Save 63%

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