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 $24,022 CAD to $72,550 CAD, with a median price of $42,362 CAD. There are currently 170 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 170 natural radiant diamonds with I color and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $24,022 CAD to $72,550 CAD, with a median of $42,362 CAD. At least 38 retailers stock this exact specification. Half of all listings fall between $9,612 CAD and $14,318 CAD per carat. The same specification in lab grown form lists at a median of about $18,222 CAD 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

170

Lowest Price

$13,372 CAD

Highest Price

$187,453 CAD

Average Price

$46,530 CAD

Market Intelligence

Retailers Selling

Price Spread

40.7%

Price Range

Price per carat distribution across retailers

$8,352/ct

10th Percentile

$5,593

Median

$8,352

90th Percentile

$11,798

Score Distribution

170 diamonds scored across 4 quality tiers

Excellent

38 (22.4%)

Very Good

54 (31.8%)

Good

25 (14.7%)

Average

53 (31.2%)

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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