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

As of November 2026, 3.00 to 4.99ct I SI2 natural radiant diamonds typically cost €21,526 EUR to €74,947 EUR, with a median price of €36,456 EUR. There are currently 57 diamonds matching this specification available across retailers.

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

About 33% of these diamonds are available at multiple retailers, with an average price spread of 33%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I SI2 Natural Radiant

Quick answer

As of November 2026, there are 57 natural radiant diamonds with I color and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run €21,526 EUR to €74,947 EUR, with a median of €36,456 EUR. At least 42 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 33%. Half of all listings fall between €6,167 EUR and €8,701 EUR per carat. Over the last 30 days the median price moved -0.3% and the number of listings moved +9.3%.

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: November 2026

Available

Lowest Price

€9,097 EUR

Highest Price

€121,076 EUR

Average Price

€41,435 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

33.2%

Price Spread

32.8%

30-Day Price Trend

-0.3%

30-Day Supply Change

+9.3%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$8,643/ct

10th Percentile

$5,082

Median

$8,643

90th Percentile

$10,962

Score Distribution

194 diamonds scored across 4 quality tiers

Excellent

36 (18.6%)

Very Good

34 (17.5%)

Good

22 (11.3%)

Average

102 (52.6%)

Find Your Diamond

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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