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 $4,246 USD to $16,601 USD, with a median price of $8,358 USD. There are currently 182 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 182 natural marquise diamonds with F color and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $4,246 USD to $16,601 USD, with a median of $8,358 USD. At least 52 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 $4,044 USD and $6,803 USD per carat. Over the last 30 days the median price moved -2.1% and the number of listings moved +14.6%.

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

182

Lowest Price

$2,788 USD

Highest Price

$28,305 USD

Average Price

$9,590 USD

Market Intelligence

Retailers Selling

Cross Retailer %

35.9%

Price Spread

49.8%

30-Day Price Trend

-2.1%

30-Day Supply Change

+14.6%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$5,536/ct

10th Percentile

$3,065

Median

$5,536

90th Percentile

$8,596

Score Distribution

436 diamonds scored across 4 quality tiers

Excellent

84 (19.3%)

Very Good

126 (28.9%)

Good

79 (18.1%)

Average

147 (33.7%)

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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