How much does a 5.00ct+ D SI1 natural radiant diamond cost?

As of October 2026, 5.00ct+ D SI1 natural radiant diamonds typically cost $145,661 NZD to $502,302 NZD, with a median price of $253,545 NZD. There are currently 12 diamonds matching this specification available across retailers.

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

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5.00ct+ D SI1 Natural Radiant

Quick answer

As of October 2026, there are 12 natural radiant diamonds with D colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $145,661 NZD to $502,302 NZD, with a median of $253,545 NZD. The same specification in lab grown form lists at a median of about $502 NZD per carat.

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

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Radiant natural stones in the index: 3,091 USD per carat, +13.2% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

Lowest Price

$130,879 NZD

Highest Price

$666,246 NZD

Average Price

$303,884 NZD

Score Distribution

28 diamonds scored across 4 quality tiers

Excellent

7 (25.0%)

Very Good

7 (25.0%)

Good

4 (14.3%)

Average

10 (35.7%)

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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