How much does a 3.00 to 4.99ct E SI1 lab grown radiant diamond cost?

As of September 2026, 3.00 to 4.99ct E SI1 lab grown radiant diamonds typically cost £422 GBP to £4,121 GBP, with a median price of £2,243 GBP. There are currently 215 diamonds matching this specification available across retailers.

Where can I find the best price on a E SI1 radiant diamond?

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3.00 to 4.99ct E SI1 Lab Grown Radiant

Quick answer

As of September 2026, there are 215 lab grown radiant diamonds with E colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £422 GBP to £4,121 GBP, with a median of £2,243 GBP. At least 24 retailers stock this exact specification. Half of all listings fall between £178 GBP and £805 GBP per carat. The same specification in natural form lists at a median of about £13,009 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. Radiant lab grown stones in the index: 473 USD per carat, -12.5% 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

215

Lowest Price

£179 GBP

Highest Price

£68,544 GBP

Average Price

£2,290 GBP

Market Intelligence

Retailers Selling

Price Spread

218.6%

Price Range

Price per carat distribution across retailers

$387/ct

10th Percentile

$196

Median

$387

90th Percentile

$1,557

Score Distribution

215 diamonds scored across 4 quality tiers

Excellent

40 (18.6%)

Very Good

37 (17.2%)

Good

26 (12.1%)

Average

112 (52.1%)

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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