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 $17,334 USD to $52,352 USD, with a median price of $30,621 USD. There are currently 170 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.

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 $17,334 USD to $52,352 USD, with a median of $30,621 USD. At least 40 retailers stock this exact specification. Half of all listings fall between $7,705 USD and $11,597 USD per carat. The same specification in lab grown form lists at a median of about $13,149 USD 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

$9,649 USD

Highest Price

$135,267 USD

Average Price

$33,579 USD

Market Intelligence

Retailers Selling

Price Spread

39.8%

Price Range

Price per carat distribution across retailers

$9,776/ct

10th Percentile

$6,183

Median

$9,776

90th Percentile

$13,130

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%)

Find Your Diamond

Search 170 I SI2 radiant diamonds and compare prices.

Search Diamonds

Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

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

Save 28%

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