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

As of September 2026, 3.00 to 4.99ct I SI2 natural round diamonds typically cost $17,926 SGD to $66,190 SGD, with a median price of $35,193 SGD. There are currently 1,278 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct I SI2 Natural Round

Quick answer

As of September 2026, there are 1,278 natural round diamonds with I colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $17,926 SGD to $66,190 SGD, with a median of $35,193 SGD. At least 47 retailers stock this exact specification. Half of all listings fall between $8,567 SGD and $14,926 SGD per carat. The same specification in lab grown form lists at a median of about $12,965 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. Round natural stones in the index: 2,094 USD per carat, -3.8% 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

1,278

Lowest Price

$10,737 SGD

Highest Price

$153,102 SGD

Average Price

$38,647 SGD

Market Intelligence

Retailers Selling

Price Spread

52.5%

Price Range

Price per carat distribution across retailers

$9,082/ct

10th Percentile

$5,161

Median

$9,082

90th Percentile

$13,076

Score Distribution

1.3K diamonds scored across 4 quality tiers

Excellent

369 (28.9%)

Very Good

443 (34.7%)

Good

308 (24.1%)

Average

158 (12.4%)

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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