How much does a 0.20 to 0.49ct J SI2 natural radiant diamond cost?

As of October 2026, 0.20 to 0.49ct J SI2 natural radiant diamonds typically cost $306 USD to $567 USD, with a median price of $422 USD. There are currently 7 diamonds matching this specification available across retailers.

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

About 14% 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.

0.20 to 0.49ct J SI2 Natural Radiant

Quick answer

As of October 2026, there are 7 natural radiant diamonds with J color and SI2 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $306 USD to $567 USD, with a median of $422 USD. At least 22 retailers stock this exact specification, and 14% of the stones appear at more than one of them, with an average price spread of 32%. Half of all listings fall between $971 USD and $1,321 USD per carat. Over the last 30 days the median price moved -2.0% and the number of listings moved +1.7%.

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

$158 USD

Highest Price

$986 USD

Average Price

$422 USD

Market Intelligence

Retailers Selling

Cross Retailer %

13.7%

Price Spread

32.1%

30-Day Price Trend

-2.0%

30-Day Supply Change

+1.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,090/ct

10th Percentile

$711

Median

$1,090

90th Percentile

$1,591

Score Distribution

44 diamonds scored across 4 quality tiers

Excellent

3 (6.8%)

Very Good

2 (4.5%)

Good

4 (9.1%)

Average

35 (79.5%)

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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