How much does a 1.50 to 1.99ct H SI1 natural round diamond cost?

As of October 2026, 1.50 to 1.99ct H SI1 natural round diamonds typically cost $8,942 NZD to $25,693 NZD, with a median price of $14,771 NZD. There are currently 1,744 diamonds matching this specification available across retailers.

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

About 40% of these diamonds are available at multiple retailers, with an average price spread of 47%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct H SI1 Natural Round

Quick answer

As of October 2026, there are 1,744 natural round diamonds with H colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $8,942 NZD to $25,693 NZD, with a median of $14,771 NZD. At least 68 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 47%. Half of all listings fall between $6,619 NZD and $10,532 NZD per carat. The same specification in lab grown form lists at a median of about $1,868 NZD per carat. Over the last 30 days the median price moved -1.5% and the number of listings moved +15.2%.

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. 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

1,744

Lowest Price

$4,922 NZD

Highest Price

$41,245 NZD

Average Price

$16,170 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

40.3%

Price Spread

47.0%

30-Day Price Trend

-1.5%

30-Day Supply Change

+15.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$4,696/ct

10th Percentile

$3,012

Median

$4,696

90th Percentile

$7,519

Score Distribution

3.7K diamonds scored across 4 quality tiers

Excellent

389 (10.4%)

Very Good

964 (25.7%)

Good

807 (21.5%)

Average

1,589 (42.4%)

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Consider Instead

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

H SI2SI2 inclusions are not visible without magnification

Save 20%

Lab-Grown H SI1Same specifications, lab-grown origin

Save 78%

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