How much does a 0.20 to 0.49ct J SI2 natural round diamond cost?

As of October 2026, 0.20 to 0.49ct J SI2 natural round diamonds typically cost $373 NZD to $1,156 NZD, with a median price of $713 NZD. There are currently 1,921 diamonds matching this specification available across retailers.

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

About 39% of these diamonds are available at multiple retailers, with an average price spread of 55%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct J SI2 Natural Round

Quick answer

As of October 2026, there are 1,921 natural round diamonds with J colour and SI2 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $373 NZD to $1,156 NZD, with a median of $713 NZD. At least 27 retailers stock this exact specification, and 39% of the stones appear at more than one of them, with an average price spread of 55%. Half of all listings fall between $1,342 NZD and $2,258 NZD per carat. The same specification in lab grown form lists at a median of about $813 NZD per carat. Over the last 30 days the median price moved -5.1% and the number of listings moved +10.6%.

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

1,921

Lowest Price

$125 NZD

Highest Price

$3,151 NZD

Average Price

$759 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

38.9%

Price Spread

54.7%

30-Day Price Trend

-5.1%

30-Day Supply Change

+10.6%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$941/ct

10th Percentile

$620

Median

$941

90th Percentile

$1,715

Score Distribution

3.5K diamonds scored across 4 quality tiers

Excellent

595 (16.9%)

Very Good

759 (21.6%)

Good

1,140 (32.5%)

Average

1,019 (29.0%)

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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