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

As of November 2026, 1.50 to 1.99ct I IF natural marquise diamonds typically cost $9,025 SGD to $14,662 SGD, with a median price of $11,253 SGD. There are currently 9 diamonds matching this specification available across retailers.

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

About 40% 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 I IF Natural Marquise

Quick answer

As of November 2026, there are 9 natural marquise diamonds with I colour and IF clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $9,025 SGD to $14,662 SGD, with a median of $11,253 SGD. At least 46 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 33%. Half of all listings fall between $7,858 SGD and $10,871 SGD per carat. The same specification in lab grown form lists at a median of about $813 SGD per carat. Over the last 30 days the median price moved -5.2% and the number of listings moved +30.4%.

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

$7,357 SGD

Highest Price

$24,042 SGD

Average Price

$11,534 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

40.0%

Price Spread

33.2%

30-Day Price Trend

-5.2%

30-Day Supply Change

+30.4%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$7,090/ct

10th Percentile

$5,421

Median

$7,090

90th Percentile

$9,983

Score Distribution

25 diamonds scored across 4 quality tiers

Excellent

12 (48.0%)

Very Good

7 (28.0%)

Good

4 (16.0%)

Average

2 (8.0%)

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Consider Instead

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

J IFJ colour is visually identical to I to the naked eye

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Lab-Grown I IFSame 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