How much does a 5.00ct+ J SI1 lab grown radiant diamond cost?

As of September 2026, 5.00ct+ J SI1 lab grown radiant diamonds typically cost €10,617 EUR to €72,401 EUR, with a median price of €14,884 EUR. There are currently 20 diamonds matching this specification available across retailers.

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

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5.00ct+ J SI1 Lab Grown Radiant

Quick answer

As of September 2026, there are 20 lab grown radiant diamonds with J colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run €10,617 EUR to €72,401 EUR, with a median of €14,884 EUR. At least 4 retailers stock this exact specification. Half of all listings fall between €8,325 EUR and €13,608 EUR per carat. The same specification in natural form lists at a median of about €10,469 EUR per carat.

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

5.04ct Radiant J SI1, AGS, score 63 of 100, from €68,169 EUR

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

Lowest Price

€8,808 EUR

Highest Price

€143,207 EUR

Average Price

€36,448 EUR

Market Intelligence

Retailers Selling

Price Spread

43.5%

Price Range

Price per carat distribution across retailers

$14,006/ct

10th Percentile

$5,846

Median

$14,006

90th Percentile

$17,883

Score Distribution

20 diamonds scored across 3 quality tiers

Very Good

5 (25.0%)

Good

10 (50.0%)

Average

5 (25.0%)

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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