How much does a 1.50 to 1.99ct J SI1 natural radiant diamond cost?

As of November 2026, 1.50 to 1.99ct J SI1 natural radiant diamonds typically cost $5,531 NZD to $14,741 NZD, with a median price of $8,925 NZD. There are currently 168 diamonds matching this specification available across retailers.

Where can I find the best price on a J SI1 radiant diamond?

About 40% of these diamonds are available at multiple retailers, with an average price spread of 54%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct J SI1 Natural Radiant

Quick answer

As of November 2026, there are 168 natural radiant diamonds with J colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $5,531 NZD to $14,741 NZD, with a median of $8,925 NZD. At least 54 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 54%. Half of all listings fall between $4,251 NZD and $7,110 NZD per carat. The same specification in lab grown form lists at a median of about $1,509 NZD per carat. Over the last 30 days the median price moved -1.2% and the number of listings moved +18.5%.

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: November 2026

Available

168

Lowest Price

$3,423 NZD

Highest Price

$29,068 NZD

Average Price

$9,784 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

40.1%

Price Spread

53.8%

30-Day Price Trend

-1.2%

30-Day Supply Change

+18.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,993/ct

10th Percentile

$2,009

Median

$2,993

90th Percentile

$4,886

Score Distribution

453 diamonds scored across 4 quality tiers

Excellent

72 (15.9%)

Very Good

79 (17.4%)

Good

78 (17.2%)

Average

224 (49.4%)

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Consider Instead

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

J SI2SI2 inclusions are not visible without magnification

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Lab-Grown J SI1Same 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