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

As of September 2026, 5.00ct+ F SI1 lab grown round diamonds typically cost £625 GBP to £5,304 GBP, with a median price of £1,215 GBP. There are currently 445 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 Lab Grown Round

Quick answer

As of September 2026, there are 445 lab grown round diamonds with F colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £625 GBP to £5,304 GBP, with a median of £1,215 GBP. At least 24 retailers stock this exact specification. Half of all listings fall between £228 GBP and £605 GBP per carat. The same specification in natural form lists at a median of about £22,033 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 lab grown stones in the index: 438 USD per carat, -14.1% 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

445

Lowest Price

£335 GBP

Highest Price

£31,817 GBP

Average Price

£2,285 GBP

Market Intelligence

Retailers Selling

Price Spread

116.6%

Price Range

Price per carat distribution across retailers

$437/ct

10th Percentile

$227

Median

$437

90th Percentile

$1,360

Score Distribution

445 diamonds scored across 4 quality tiers

Excellent

133 (29.9%)

Very Good

122 (27.4%)

Good

99 (22.2%)

Average

91 (20.4%)

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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