How much does a 0.20 to 0.49ct J I1 natural round diamond cost?

As of October 2026, 0.20 to 0.49ct J I1 natural round diamonds typically cost $238 AUD to $939 AUD, with a median price of $562 AUD. There are currently 382 diamonds matching this specification available across retailers.

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

About 42% of these diamonds are available at multiple retailers, with an average price spread of 41%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct J I1 Natural Round

Quick answer

As of October 2026, there are 382 natural round diamonds with J colour and I1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $238 AUD to $939 AUD, with a median of $562 AUD. At least 14 retailers stock this exact specification, and 42% of the stones appear at more than one of them, with an average price spread of 41%. Half of all listings fall between $1,063 AUD and $1,600 AUD per carat. The same specification in lab grown form lists at a median of about $1,007 AUD per carat. Over the last 30 days the median price moved +14.7% and the number of listings moved -41.9%.

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. 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

382

Lowest Price

$111 AUD

Highest Price

$2,152 AUD

Average Price

$570 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

42.1%

Price Spread

40.8%

30-Day Price Trend

+14.7%

30-Day Supply Change

-41.9%

Volatility (30d)

0.10

Price Range

Price per carat distribution across retailers

$925/ct

10th Percentile

$498

Median

$925

90th Percentile

$1,360

Score Distribution

688 diamonds scored across 4 quality tiers

Excellent

78 (11.3%)

Very Good

137 (19.9%)

Good

102 (14.8%)

Average

371 (53.9%)

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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