How much does a 1.50 to 1.99ct J SI2 natural radiant diamond cost?

As of October 2026, 1.50 to 1.99ct J SI2 natural radiant diamonds typically cost $4,155 AUD to $11,089 AUD, with a median price of $6,932 AUD. There are currently 130 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 51%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct J SI2 Natural Radiant

Quick answer

As of October 2026, there are 130 natural radiant diamonds with J colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $4,155 AUD to $11,089 AUD, with a median of $6,932 AUD. At least 49 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 51%. Half of all listings fall between $3,112 AUD and $5,189 AUD per carat. Over the last 30 days the median price moved -2.5% and the number of listings moved +23.2%.

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

130

Lowest Price

$2,542 AUD

Highest Price

$20,301 AUD

Average Price

$7,333 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

31.9%

Price Spread

51.2%

30-Day Price Trend

-2.5%

30-Day Supply Change

+23.2%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,849/ct

10th Percentile

$1,804

Median

$2,849

90th Percentile

$4,444

Score Distribution

517 diamonds scored across 4 quality tiers

Excellent

62 (12.0%)

Very Good

89 (17.2%)

Good

85 (16.4%)

Average

281 (54.4%)

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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