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

As of November 2026, 1.50 to 1.99ct I I1 natural marquise diamonds typically cost $6,466 SGD to $24,788 SGD, with a median price of $15,408 SGD. There are currently 16 diamonds matching this specification available across retailers.

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

About 6% of these diamonds are available at multiple retailers, with an average price spread of 73%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I I1 Natural Marquise

Quick answer

As of November 2026, there are 16 natural marquise diamonds with I colour and I1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $6,466 SGD to $24,788 SGD, with a median of $15,408 SGD. At least 26 retailers stock this exact specification, and 6% of the stones appear at more than one of them, with an average price spread of 73%. Half of all listings fall between $4,749 SGD and $11,068 SGD per carat. Over the last 30 days the median price moved -2.3% and the number of listings moved +6.1%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Marquise natural stones in the index: 2,177 USD per carat, -4.2% 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

$2,784 SGD

Highest Price

$38,503 SGD

Average Price

$16,281 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

6.1%

Price Spread

73.2%

30-Day Price Trend

-2.3%

30-Day Supply Change

+6.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$6,749/ct

10th Percentile

$2,553

Median

$6,749

90th Percentile

$10,618

Score Distribution

151 diamonds scored across 4 quality tiers

Excellent

5 (3.3%)

Very Good

12 (7.9%)

Good

10 (6.6%)

Average

124 (82.1%)

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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