How much does a 1.00 to 1.49ct J SI2 natural radiant diamond cost?

As of October 2026, 1.00 to 1.49ct J SI2 natural radiant diamonds typically cost $1,241 USD to $3,811 USD, with a median price of $2,177 USD. There are currently 120 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 64%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J SI2 Natural Radiant

Quick answer

As of October 2026, there are 120 natural radiant diamonds with J color and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,241 USD to $3,811 USD, with a median of $2,177 USD. At least 50 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 64%. Half of all listings fall between $1,273 USD and $2,335 USD per carat. The same specification in lab grown form lists at a median of about $908 USD per carat. Over the last 30 days the median price moved -1.1% and the number of listings moved +16.9%.

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

120

Lowest Price

$734 USD

Highest Price

$6,997 USD

Average Price

$2,362 USD

Market Intelligence

Retailers Selling

Cross Retailer %

36.1%

Price Spread

64.0%

30-Day Price Trend

-1.1%

30-Day Supply Change

+16.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,660/ct

10th Percentile

$1,084

Median

$1,660

90th Percentile

$2,905

Score Distribution

430 diamonds scored across 4 quality tiers

Excellent

48 (11.2%)

Very Good

66 (15.3%)

Good

83 (19.3%)

Average

233 (54.2%)

Find Your Diamond

Search 120 J 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.

Lab-Grown J SI2Same specifications, lab-grown origin

Save 45%

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