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

As of October 2026, 1.50 to 1.99ct H SI2 natural round diamonds typically cost $5,381 NZD to $18,770 NZD, with a median price of $10,159 NZD. There are currently 2,173 diamonds matching this specification available across retailers.

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

About 46% 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 H SI2 Natural Round

Quick answer

As of October 2026, there are 2,173 natural round diamonds with H colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $5,381 NZD to $18,770 NZD, with a median of $10,159 NZD. At least 60 retailers stock this exact specification, and 46% of the stones appear at more than one of them, with an average price spread of 54%. Half of all listings fall between $4,951 NZD and $8,521 NZD per carat. The same specification in lab grown form lists at a median of about $1,684 NZD per carat. Over the last 30 days the median price moved -1.4% and the number of listings moved +13.0%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

2,173

Lowest Price

$2,640 NZD

Highest Price

$38,415 NZD

Average Price

$11,274 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

45.8%

Price Spread

53.6%

30-Day Price Trend

-1.4%

30-Day Supply Change

+13.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$3,751/ct

10th Percentile

$2,121

Median

$3,751

90th Percentile

$6,066

Score Distribution

4.3K diamonds scored across 4 quality tiers

Excellent

1,081 (25.2%)

Very Good

1,197 (27.9%)

Good

772 (18.0%)

Average

1,238 (28.9%)

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Consider Instead

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

H I1I1 inclusions are not visible without magnification

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Lab-Grown H SI2Same specifications, lab-grown origin

Save 75%

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