How much does a 5.00ct+ I SI2 lab grown radiant diamond cost?

As of September 2026, 5.00ct+ I SI2 lab grown radiant diamonds typically cost $68,162 USD to $275,596 USD, with a median price of $86,182 USD. There are currently 3 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI2 radiant diamond?

Compare prices across retailers on Carat Hunter to see all your options.

5.00ct+ I SI2 Lab Grown Radiant

Quick answer

As of September 2026, there are 3 lab grown radiant diamonds with I color and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $68,162 USD to $275,596 USD, with a median of $86,182 USD. The same specification in natural form lists at a median of about $16,234 USD per carat.

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

10.11ct Radiant I SI2, GIA, score 75 of 100, from $322,950 USD

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

$63,657 USD

Highest Price

$333,710 USD

Average Price

$157,596 USD

Score Distribution

3 diamonds scored across 3 quality tiers

Very Good

1 (33.3%)

Good

1 (33.3%)

Average

1 (33.3%)

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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