How much does a 1.50 to 1.99ct F SI2 natural marquise diamond cost?

As of October 2026, 1.50 to 1.99ct F SI2 natural marquise diamonds typically cost $5,486 SGD to $21,556 SGD, with a median price of $10,875 SGD. There are currently 202 diamonds matching this specification available across retailers.

Where can I find the best price on a F SI2 marquise diamond?

About 36% of these diamonds are available at multiple retailers, with an average price spread of 50%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct F SI2 Natural Marquise

Quick answer

As of October 2026, there are 202 natural marquise diamonds with F colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $5,486 SGD to $21,556 SGD, with a median of $10,875 SGD. At least 53 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 50%. Half of all listings fall between $5,211 SGD and $8,744 SGD per carat. Over the last 30 days the median price moved -2.0% and the number of listings moved +15.0%.

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: October 2026

Available

202

Lowest Price

$3,575 SGD

Highest Price

$40,121 SGD

Average Price

$12,429 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

36.3%

Price Spread

49.8%

30-Day Price Trend

-2.0%

30-Day Supply Change

+15.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$5,532/ct

10th Percentile

$3,072

Median

$5,532

90th Percentile

$8,611

Score Distribution

513 diamonds scored across 4 quality tiers

Excellent

101 (19.7%)

Very Good

155 (30.2%)

Good

106 (20.7%)

Average

151 (29.4%)

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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