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

As of October 2026, 0.20 to 0.49ct I I1 natural round diamonds typically cost $328 NZD to $1,215 NZD, with a median price of $720 NZD. There are currently 547 diamonds matching this specification available across retailers.

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

About 23% of these diamonds are available at multiple retailers, with an average price spread of 81%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct I I1 Natural Round

Quick answer

As of October 2026, there are 547 natural round diamonds with I colour and I1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $328 NZD to $1,215 NZD, with a median of $720 NZD. At least 17 retailers stock this exact specification, and 23% of the stones appear at more than one of them, with an average price spread of 81%. Half of all listings fall between $1,125 NZD and $2,492 NZD per carat. The same specification in lab grown form lists at a median of about $906 NZD per carat. Over the last 30 days the median price moved 0.0% and the number of listings moved -2.2%.

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

547

Lowest Price

$156 NZD

Highest Price

$3,167 NZD

Average Price

$747 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

22.6%

Price Spread

81.4%

30-Day Price Trend

0.0%

30-Day Supply Change

-2.2%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$946/ct

10th Percentile

$406

Median

$946

90th Percentile

$1,836

Score Distribution

1.0K diamonds scored across 4 quality tiers

Excellent

80 (7.8%)

Very Good

214 (20.9%)

Good

191 (18.7%)

Average

537 (52.5%)

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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