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

As of September 2026, 1.00 to 1.49ct J SI2 natural radiant diamonds typically cost $2,079 NZD to $6,476 NZD, with a median price of $3,434 NZD. There are currently 443 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct J SI2 Natural Radiant

Quick answer

As of September 2026, there are 443 natural radiant diamonds with J colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,079 NZD to $6,476 NZD, with a median of $3,434 NZD. At least 45 retailers stock this exact specification. Half of all listings fall between $2,290 NZD and $3,832 NZD per carat. The same specification in lab grown form lists at a median of about $3,219 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. Radiant natural stones in the index: 2,765 USD per carat, +6.0% 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

443

Lowest Price

$1,404 NZD

Highest Price

$13,668 NZD

Average Price

$3,900 NZD

Market Intelligence

Retailers Selling

Price Spread

53.6%

Price Range

Price per carat distribution across retailers

$1,674/ct

10th Percentile

$1,113

Median

$1,674

90th Percentile

$2,736

Score Distribution

443 diamonds scored across 4 quality tiers

Excellent

31 (7.0%)

Very Good

90 (20.3%)

Good

110 (24.8%)

Average

212 (47.9%)

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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