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

As of July 2026, 5.00ct+ I SI2 lab grown radiant diamonds typically cost $113,603 NZD to $459,327 NZD, with a median price of $143,637 NZD. 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

Last updated: July 2026

Available

Lowest Price

$106,094 NZD

Highest Price

$556,183 NZD

Average Price

$262,660 NZD

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