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

As of September 2026, 5.00ct+ E SI1 lab grown round diamonds typically cost €718 EUR to €6,560 EUR, with a median price of €1,346 EUR. There are currently 296 diamonds matching this specification available across retailers.

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

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5.00ct+ E SI1 Lab Grown Round

Quick answer

As of September 2026, there are 296 lab grown round diamonds with E colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run €718 EUR to €6,560 EUR, with a median of €1,346 EUR. At least 21 retailers stock this exact specification. Half of all listings fall between €248 EUR and €728 EUR per carat. The same specification in natural form lists at a median of about €31,129 EUR 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

296

Lowest Price

€449 EUR

Highest Price

€93,336 EUR

Average Price

€2,696 EUR

Market Intelligence

Retailers Selling

Price Spread

135.1%

Price Range

Price per carat distribution across retailers

$412/ct

10th Percentile

$217

Median

$412

90th Percentile

$1,113

Score Distribution

296 diamonds scored across 4 quality tiers

Excellent

97 (32.8%)

Very Good

79 (26.7%)

Good

44 (14.9%)

Average

76 (25.7%)

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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