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

As of October 2026, 1.00 to 1.49ct J SI2 natural radiant diamonds typically cost $2,210 NZD to $6,784 NZD, with a median price of $3,873 NZD. There are currently 121 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 65%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J SI2 Natural Radiant

Quick answer

As of October 2026, there are 121 natural radiant diamonds with J colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,210 NZD to $6,784 NZD, with a median of $3,873 NZD. At least 49 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 65%. Half of all listings fall between $2,331 NZD and $4,304 NZD per carat. The same specification in lab grown form lists at a median of about $1,617 NZD per carat. Over the last 30 days the median price moved -0.9% and the number of listings moved +16.9%.

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. Radiant natural stones in the index: 3,091 USD per carat, +13.2% 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

121

Lowest Price

$1,307 NZD

Highest Price

$12,458 NZD

Average Price

$4,203 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

36.4%

Price Spread

64.9%

30-Day Price Trend

-0.9%

30-Day Supply Change

+16.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,706/ct

10th Percentile

$1,086

Median

$1,706

90th Percentile

$2,911

Score Distribution

431 diamonds scored across 4 quality tiers

Excellent

49 (11.4%)

Very Good

66 (15.3%)

Good

83 (19.3%)

Average

233 (54.1%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

Lab-Grown J SI2Same specifications, lab-grown origin

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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