How much does a 3.00 to 4.99ct I SI2 natural radiant diamond cost?

As of September 2026, 3.00 to 4.99ct I SI2 natural radiant diamonds typically cost $22,072 SGD to $66,617 SGD, with a median price of $38,743 SGD. There are currently 171 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct I SI2 Natural Radiant

Quick answer

As of September 2026, there are 171 natural radiant diamonds with I colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $22,072 SGD to $66,617 SGD, with a median of $38,743 SGD. At least 40 retailers stock this exact specification. Half of all listings fall between $9,767 SGD and $14,707 SGD per carat. The same specification in lab grown form lists at a median of about $16,732 SGD per carat.

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

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 natural stones in the index: 2,765 USD per carat, +6.0% 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

171

Lowest Price

$12,278 SGD

Highest Price

$172,127 SGD

Average Price

$42,698 SGD

Market Intelligence

Retailers Selling

Price Spread

40.2%

Price Range

Price per carat distribution across retailers

$9,666/ct

10th Percentile

$6,155

Median

$9,666

90th Percentile

$13,076

Score Distribution

171 diamonds scored across 4 quality tiers

Excellent

37 (21.6%)

Very Good

56 (32.7%)

Good

25 (14.6%)

Average

53 (31.0%)

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J SI2J colour is visually identical to I to the naked eye

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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