How much does a 1.50 to 1.99ct F SI1 natural round diamond cost?

As of November 2026, 1.50 to 1.99ct F SI1 natural round diamonds typically cost €5,476 EUR to €15,382 EUR, with a median price of €8,746 EUR. There are currently 930 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 44%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct F SI1 Natural Round

Quick answer

As of November 2026, there are 930 natural round diamonds with F color and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run €5,476 EUR to €15,382 EUR, with a median of €8,746 EUR. At least 68 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 44%. Half of all listings fall between €4,447 EUR and €6,877 EUR per carat. The same specification in lab grown form lists at a median of about €340 EUR per carat. Over the last 30 days the median price moved -1.4% and the number of listings moved +14.1%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

930

Lowest Price

€1,915 EUR

Highest Price

€24,487 EUR

Average Price

€9,685 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

38.4%

Price Spread

44.4%

30-Day Price Trend

-1.4%

30-Day Supply Change

+14.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$6,112/ct

10th Percentile

$4,167

Median

$6,112

90th Percentile

$9,548

Score Distribution

2.2K diamonds scored across 4 quality tiers

Excellent

259 (11.8%)

Very Good

580 (26.5%)

Good

443 (20.2%)

Average

906 (41.4%)

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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 33%

Lab-Grown F SI1Same specifications, lab-grown origin

Save 94%

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