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

As of October 2026, 5.00ct+ I SI2 natural radiant diamonds typically cost $61,980 SGD to $179,562 SGD, with a median price of $118,606 SGD. There are currently 22 diamonds matching this specification available across retailers.

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

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5.00ct+ I SI2 Natural Radiant

Quick answer

As of October 2026, there are 22 natural radiant diamonds with I colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $61,980 SGD to $179,562 SGD, with a median of $118,606 SGD.

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

$43,811 SGD

Highest Price

$404,450 SGD

Average Price

$131,325 SGD

Score Distribution

54 diamonds scored across 4 quality tiers

Excellent

9 (16.7%)

Very Good

7 (13.0%)

Good

13 (24.1%)

Average

25 (46.3%)

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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