How much does a 0.50 to 0.74ct F SI1 natural round diamond cost?

As of October 2026, 0.50 to 0.74ct F SI1 natural round diamonds typically cost £462 GBP to £1,427 GBP, with a median price of £784 GBP. There are currently 10,348 diamonds matching this specification available across retailers.

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

About 40% 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.

0.50 to 0.74ct F SI1 Natural Round

Quick answer

As of October 2026, there are 10,348 natural round diamonds with F colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run £462 GBP to £1,427 GBP, with a median of £784 GBP. At least 68 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 50%. Half of all listings fall between £1,075 GBP and £1,731 GBP per carat. The same specification in lab grown form lists at a median of about £575 GBP per carat. Over the last 30 days the median price moved -2.1% and the number of listings moved +10.2%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

10,348

Lowest Price

£269 GBP

Highest Price

£2,718 GBP

Average Price

£879 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

40.2%

Price Spread

50.0%

30-Day Price Trend

-2.1%

30-Day Supply Change

+10.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,760/ct

10th Percentile

$1,240

Median

$1,760

90th Percentile

$3,267

Score Distribution

16.5K diamonds scored across 4 quality tiers

Excellent

3,789 (22.9%)

Very Good

4,299 (26.0%)

Good

4,478 (27.1%)

Average

3,963 (24.0%)

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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 14%

Lab-Grown F SI1Same specifications, lab-grown origin

Save 56%

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