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 $1,767 AUD to $5,423 AUD, with a median price of $3,096 AUD. There are currently 121 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 63%. 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 121 natural radiant diamonds with J colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,767 AUD to $5,423 AUD, with a median of $3,096 AUD. 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 63%. Half of all listings fall between $1,830 AUD and $3,342 AUD per carat. The same specification in lab grown form lists at a median of about $1,292 AUD per carat. Over the last 30 days the median price moved -1.3% and the number of listings moved +20.0%.

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

121

Lowest Price

$1,045 AUD

Highest Price

$9,960 AUD

Average Price

$3,360 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

36.3%

Price Spread

63.5%

30-Day Price Trend

-1.3%

30-Day Supply Change

+20.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,674/ct

10th Percentile

$1,086

Median

$1,674

90th Percentile

$2,912

Score Distribution

431 diamonds scored across 4 quality tiers

Excellent

49 (11.4%)

Very Good

66 (15.3%)

Good

83 (19.3%)

Average

233 (54.1%)

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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 46%

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