How much does a 1.00 to 1.49ct J I1 natural round diamond cost?

As of October 2026, 1.00 to 1.49ct J I1 natural round diamonds typically cost $1,603 AUD to $5,111 AUD, with a median price of $2,966 AUD. There are currently 408 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 66%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J I1 Natural Round

Quick answer

As of October 2026, there are 408 natural round diamonds with J colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,603 AUD to $5,111 AUD, with a median of $2,966 AUD. At least 31 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 66%. Half of all listings fall between $1,758 AUD and $3,296 AUD per carat. The same specification in lab grown form lists at a median of about $1,018 AUD per carat. Over the last 30 days the median price moved -2.4% and the number of listings moved +5.2%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

408

Lowest Price

$746 AUD

Highest Price

$9,940 AUD

Average Price

$3,271 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

33.8%

Price Spread

66.3%

30-Day Price Trend

-2.4%

30-Day Supply Change

+5.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,630/ct

10th Percentile

$932

Median

$1,630

90th Percentile

$3,234

Score Distribution

1.1K diamonds scored across 4 quality tiers

Excellent

61 (5.4%)

Very Good

217 (19.3%)

Good

152 (13.5%)

Average

692 (61.7%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

Lab-Grown J I1Same specifications, lab-grown origin

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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