How much does a 3.00 to 4.99ct F SI1 natural round diamond cost?

As of October 2026, 3.00 to 4.99ct F SI1 natural round diamonds typically cost £28,229 GBP to £71,644 GBP, with a median price of £45,139 GBP. There are currently 180 diamonds matching this specification available across retailers.

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

About 28% of these diamonds are available at multiple retailers, with an average price spread of 30%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct F SI1 Natural Round

Quick answer

As of October 2026, there are 180 natural round diamonds with F colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £28,229 GBP to £71,644 GBP, with a median of £45,139 GBP. At least 61 retailers stock this exact specification, and 28% of the stones appear at more than one of them, with an average price spread of 30%. Half of all listings fall between £9,821 GBP and £13,231 GBP per carat. The same specification in lab grown form lists at a median of about £293 GBP per carat. Over the last 30 days the median price moved -1.5% and the number of listings moved +10.1%.

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

180

Lowest Price

£16,424 GBP

Highest Price

£131,308 GBP

Average Price

£47,784 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

27.9%

Price Spread

29.7%

30-Day Price Trend

-1.5%

30-Day Supply Change

+10.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$15,277/ct

10th Percentile

$11,270

Median

$15,277

90th Percentile

$20,474

Score Distribution

545 diamonds scored across 4 quality tiers

Excellent

43 (7.9%)

Very Good

133 (24.4%)

Good

134 (24.6%)

Average

235 (43.1%)

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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 26%

Lab-Grown F SI1Same specifications, lab-grown origin

Save 97%

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