How much does a 1.00 to 1.49ct J SI2 natural round diamond cost?

As of September 2026, 1.00 to 1.49ct J SI2 natural round diamonds typically cost $2,261 NZD to $6,573 NZD, with a median price of $3,517 NZD. There are currently 4,018 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct J SI2 Natural Round

Quick answer

As of September 2026, there are 4,018 natural round diamonds with J colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,261 NZD to $6,573 NZD, with a median of $3,517 NZD. At least 53 retailers stock this exact specification. Half of all listings fall between $2,663 NZD and $4,004 NZD per carat. The same specification in lab grown form lists at a median of about $2,246 NZD per carat.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Round natural stones in the index: 2,094 USD per carat, -3.8% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

4,018

Lowest Price

$1,240 NZD

Highest Price

$32,788 NZD

Average Price

$4,002 NZD

Market Intelligence

Retailers Selling

Price Spread

41.3%

Price Range

Price per carat distribution across retailers

$1,892/ct

10th Percentile

$1,275

Median

$1,892

90th Percentile

$2,886

Score Distribution

4.0K diamonds scored across 4 quality tiers

Excellent

592 (14.7%)

Very Good

1,221 (30.4%)

Good

1,131 (28.1%)

Average

1,074 (26.7%)

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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