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

As of November 2026, 1.50 to 1.99ct D SI1 natural marquise diamonds typically cost $16,810 NZD to $45,105 NZD, with a median price of $22,613 NZD. There are currently 117 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 33%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D SI1 Natural Marquise

Quick answer

As of November 2026, there are 117 natural marquise diamonds with D colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $16,810 NZD to $45,105 NZD, with a median of $22,613 NZD. At least 62 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 33%. Half of all listings fall between $12,671 NZD and $17,540 NZD per carat. The same specification in lab grown form lists at a median of about $741 NZD per carat. Over the last 30 days the median price moved -0.9% 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. 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: November 2026

Available

117

Lowest Price

$11,982 NZD

Highest Price

$58,371 NZD

Average Price

$26,674 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

31.6%

Price Spread

33.0%

30-Day Price Trend

-0.9%

30-Day Supply Change

+13.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$8,309/ct

10th Percentile

$6,355

Median

$8,309

90th Percentile

$11,998

Score Distribution

260 diamonds scored across 4 quality tiers

Excellent

34 (13.1%)

Very Good

63 (24.2%)

Good

59 (22.7%)

Average

104 (40.0%)

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Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

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Lab-Grown D SI1Same specifications, lab-grown origin

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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