How much does a 0.20 to 0.49ct F SI1 natural marquise diamond cost?

As of October 2026, 0.20 to 0.49ct F SI1 natural marquise diamonds typically cost $301 USD to $645 USD, with a median price of $457 USD. There are currently 1,368 diamonds matching this specification available across retailers.

Where can I find the best price on a F SI1 marquise diamond?

About 35% of these diamonds are available at multiple retailers, with an average price spread of 52%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct F SI1 Natural Marquise

Quick answer

As of October 2026, there are 1,368 natural marquise diamonds with F color and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $301 USD to $645 USD, with a median of $457 USD. At least 26 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 52%. Half of all listings fall between $1,294 USD and $2,137 USD per carat. The same specification in lab grown form lists at a median of about $466 USD per carat. Over the last 30 days the median price moved -5.9% and the number of listings moved -0.5%.

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

1,368

Lowest Price

$158 USD

Highest Price

$1,350 USD

Average Price

$477 USD

Market Intelligence

Retailers Selling

Cross Retailer %

35.2%

Price Spread

51.8%

30-Day Price Trend

-5.9%

30-Day Supply Change

-0.5%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,627/ct

10th Percentile

$1,000

Median

$1,627

90th Percentile

$2,866

Score Distribution

2.4K diamonds scored across 4 quality tiers

Excellent

107 (4.4%)

Very Good

517 (21.2%)

Good

873 (35.8%)

Average

939 (38.5%)

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Consider Instead

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

F SI2SI2 inclusions are not visible without magnification

Save 8%

Lab-Grown F SI1Same specifications, lab-grown origin

Save 82%

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