How much does a 5.00ct+ F SI1 natural round diamond cost?

As of September 2026, 5.00ct+ F SI1 natural round diamonds typically cost £61,992 GBP to £244,365 GBP, with a median price of £107,679 GBP. There are currently 149 diamonds matching this specification available across retailers.

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

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5.00ct+ F SI1 Natural Round

Quick answer

As of September 2026, there are 149 natural round diamonds with F colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £61,992 GBP to £244,365 GBP, with a median of £107,679 GBP. At least 12 retailers stock this exact specification. Half of all listings fall between £19,909 GBP and £26,446 GBP per carat. The same specification in lab grown form lists at a median of about £321 GBP per carat.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Round natural stones in the index: 2,094 USD per carat, -3.8% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

149

Lowest Price

£32,954 GBP

Highest Price

£2,439,982 GBP

Average Price

£164,879 GBP

Market Intelligence

Retailers Selling

Price Spread

29.2%

Price Range

Price per carat distribution across retailers

$28,445/ct

10th Percentile

$22,622

Median

$28,445

90th Percentile

$43,582

Score Distribution

149 diamonds scored across 4 quality tiers

Excellent

24 (16.1%)

Very Good

32 (21.5%)

Good

53 (35.6%)

Average

40 (26.8%)

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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 24%

Lab-Grown F SI1Same specifications, lab-grown origin

Save 98%

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