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

As of October 2026, 1.50 to 1.99ct H SI1 natural marquise diamonds typically cost $12,703 NZD to $38,783 NZD, with a median price of $19,534 NZD. There are currently 82 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 39%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct H SI1 Natural Marquise

Quick answer

As of October 2026, there are 82 natural marquise diamonds with H colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $12,703 NZD to $38,783 NZD, with a median of $19,534 NZD. At least 59 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 39%. Half of all listings fall between $9,479 NZD and $13,979 NZD per carat. The same specification in lab grown form lists at a median of about $1,771 NZD per carat. Over the last 30 days the median price moved -4.8% and the number of listings moved +21.7%.

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. Marquise natural stones in the index: 2,268 USD per carat, +10.8% 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

Lowest Price

$8,516 NZD

Highest Price

$50,425 NZD

Average Price

$23,106 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

33.8%

Price Spread

38.7%

30-Day Price Trend

-4.8%

30-Day Supply Change

+21.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$6,532/ct

10th Percentile

$4,433

Median

$6,532

90th Percentile

$9,733

Score Distribution

226 diamonds scored across 4 quality tiers

Excellent

4 (1.8%)

Very Good

49 (21.7%)

Good

71 (31.4%)

Average

102 (45.1%)

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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 28%

Lab-Grown H SI1Same specifications, lab-grown origin

Save 85%

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