How much does a 0.75 to 0.99ct J I1 natural radiant diamond cost?

As of October 2026, 0.75 to 0.99ct J I1 natural radiant diamonds typically cost $1,336 AUD to $2,130 AUD, with a median price of $1,706 AUD. There are currently 3 diamonds matching this specification available across retailers.

Where can I find the best price on a J I1 radiant diamond?

About 5% of these diamonds are available at multiple retailers, with an average price spread of 16%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct J I1 Natural Radiant

Quick answer

As of October 2026, there are 3 natural radiant diamonds with J colour and I1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,336 AUD to $2,130 AUD, with a median of $1,706 AUD. At least 9 retailers stock this exact specification, and 5% of the stones appear at more than one of them, with an average price spread of 16%. Half of all listings fall between $1,785 AUD and $2,104 AUD per carat. Over the last 30 days the median price moved -0.4% and the number of listings moved +14.0%.

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

Lowest Price

$755 AUD

Highest Price

$2,748 AUD

Average Price

$1,736 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

4.9%

Price Spread

16.4%

30-Day Price Trend

-0.4%

30-Day Supply Change

+14.0%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,365/ct

10th Percentile

$960

Median

$1,365

90th Percentile

$1,581

Score Distribution

78 diamonds scored across 3 quality tiers

Excellent

1 (1.3%)

Good

1 (1.3%)

Average

76 (97.4%)

Find Your Diamond

Search 3 J I1 radiant diamonds and compare prices.

Search Diamonds

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