How much does a 1.00 to 1.49ct H SI1 natural radiant diamond cost?

As of November 6, 2026, 1.00 to 1.49ct H SI1 natural radiant diamonds typically cost $2,851 NZD to $9,228 NZD, with a median price of $5,326 NZD. There are currently 658 diamonds matching this specification available across retailers.

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

About 35% of these diamonds are available at multiple retailers, with an average price spread of 58%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct H SI1 Natural Radiant

Quick answer

As of November 6, 2026, there are 658 natural radiant diamonds with H colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,851 NZD to $9,228 NZD, with a median of $5,326 NZD. Half of all listings fall between $3,469 NZD and $6,350 NZD per carat. The same specification in lab grown form lists at a median of about $984 NZD per carat. Over the last 30 days the median price moved -1.6% and the number of listings moved +18.6%.

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

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Radiant natural stones in the index: 3,108 USD per carat, +0.3% month on month. See the full index release

Figures come from current listings across more than 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

658

Lowest Price

$1,064 NZD

Highest Price

$16,309 NZD

Average Price

$5,672 NZD

Market Intelligence

Cross Retailer %

35.0%

Price Spread

58.4%

30-Day Price Trend

-1.6%

30-Day Supply Change

+18.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,733/ct

10th Percentile

$1,551

Median

$2,733

90th Percentile

$4,201

Score Distribution

658 diamonds scored across 4 quality tiers

Excellent

95 (14.4%)

Very Good

119 (18.1%)

Good

144 (21.9%)

Average

300 (45.6%)

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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