How much does a 1.50 to 1.99ct H SI2 natural radiant diamond cost?

As of October 2026, 1.50 to 1.99ct H SI2 natural radiant diamonds typically cost $6,220 NZD to $17,312 NZD, with a median price of $10,681 NZD. There are currently 150 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 48%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct H SI2 Natural Radiant

Quick answer

As of October 2026, there are 150 natural radiant diamonds with H colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $6,220 NZD to $17,312 NZD, with a median of $10,681 NZD. At least 55 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 48%. Half of all listings fall between $5,159 NZD and $8,405 NZD per carat. The same specification in lab grown form lists at a median of about $2,282 NZD per carat. Over the last 30 days the median price moved -0.4% and the number of listings moved +14.2%.

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

150

Lowest Price

$3,732 NZD

Highest Price

$29,665 NZD

Average Price

$11,372 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

34.1%

Price Spread

48.1%

30-Day Price Trend

-0.4%

30-Day Supply Change

+14.2%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$3,803/ct

10th Percentile

$2,321

Median

$3,803

90th Percentile

$5,819

Score Distribution

445 diamonds scored across 4 quality tiers

Excellent

86 (19.3%)

Very Good

97 (21.8%)

Good

88 (19.8%)

Average

174 (39.1%)

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Consider Instead

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

Lab-Grown H SI2Same specifications, lab-grown origin

Save 66%

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