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

As of October 2026, 3.00 to 4.99ct I SI2 natural radiant diamonds typically cost HK$190,415 HKD to HK$656,928 HKD, with a median price of HK$319,660 HKD. There are currently 55 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 32%. 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 October 2026, there are 55 natural radiant diamonds with I colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run HK$190,415 HKD to HK$656,928 HKD, with a median of HK$319,660 HKD. At least 47 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 32%. Half of all listings fall between HK$66,065 HKD and HK$91,655 HKD per carat. Over the last 30 days the median price moved -0.5% and the number of listings moved +10.5%.

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: October 2026

Available

Lowest Price

HK$80,018 HKD

Highest Price

HK$1,061,264 HKD

Average Price

HK$364,006 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

33.9%

Price Spread

32.1%

30-Day Price Trend

-0.5%

30-Day Supply Change

+10.5%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$10,166/ct

10th Percentile

$6,351

Median

$10,166

90th Percentile

$13,242

Score Distribution

193 diamonds scored across 4 quality tiers

Excellent

33 (17.1%)

Very Good

35 (18.1%)

Good

23 (11.9%)

Average

102 (52.8%)

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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

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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