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

As of October 2026, 1.50 to 1.99ct F SI1 natural oval diamonds typically cost $6,519 USD to $15,890 USD, with a median price of $9,899 USD. There are currently 345 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 40%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct F SI1 Natural Oval

Quick answer

As of October 2026, there are 345 natural oval diamonds with F color and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $6,519 USD to $15,890 USD, with a median of $9,899 USD. At least 64 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 40%. Half of all listings fall between $4,941 USD and $7,330 USD per carat. The same specification in lab grown form lists at a median of about $486 USD per carat. Over the last 30 days the median price moved -2.3% and the number of listings moved +2.6%.

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. Oval natural stones in the index: 2,655 USD per carat, +10.2% 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

345

Lowest Price

$2,215 USD

Highest Price

$25,442 USD

Average Price

$10,704 USD

Market Intelligence

Retailers Selling

Cross Retailer %

30.3%

Price Spread

40.4%

30-Day Price Trend

-2.3%

30-Day Supply Change

+2.6%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$5,911/ct

10th Percentile

$4,230

Median

$5,911

90th Percentile

$8,940

Score Distribution

1.1K diamonds scored across 4 quality tiers

Excellent

60 (5.4%)

Very Good

250 (22.5%)

Good

230 (20.7%)

Average

571 (51.4%)

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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

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Lab-Grown F SI1Same specifications, lab-grown origin

Save 92%

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