How much does a 1.50 to 1.99ct D I1 natural marquise diamond cost?

As of November 2026, 1.50 to 1.99ct D I1 natural marquise diamonds typically cost $10,576 AUD to $37,103 AUD, with a median price of $22,616 AUD. There are currently 23 diamonds matching this specification available across retailers.

Where can I find the best price on a D I1 marquise diamond?

About 8% of these diamonds are available at multiple retailers, with an average price spread of 84%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D I1 Natural Marquise

Quick answer

As of November 2026, there are 23 natural marquise diamonds with D colour and I1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $10,576 AUD to $37,103 AUD, with a median of $22,616 AUD. At least 25 retailers stock this exact specification, and 8% of the stones appear at more than one of them, with an average price spread of 84%. Half of all listings fall between $5,723 AUD and $13,084 AUD per carat. Over the last 30 days the median price moved -4.0% and the number of listings moved +8.9%.

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

Lowest Price

$3,665 AUD

Highest Price

$46,834 AUD

Average Price

$22,246 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

8.0%

Price Spread

83.7%

30-Day Price Trend

-4.0%

30-Day Supply Change

+8.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$6,175/ct

10th Percentile

$3,019

Median

$6,175

90th Percentile

$11,310

Score Distribution

96 diamonds scored across 4 quality tiers

Excellent

10 (10.4%)

Very Good

16 (16.7%)

Good

4 (4.2%)

Average

66 (68.8%)

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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