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

As of October 2026, 0.20 to 0.49ct F SI1 natural princess diamonds typically cost £247 GBP to £723 GBP, with a median price of £405 GBP. There are currently 279 diamonds matching this specification available across retailers.

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

About 79% of these diamonds are available at multiple retailers, with an average price spread of 39%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct F SI1 Natural Princess

Quick answer

As of October 2026, there are 279 natural princess diamonds with F colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £247 GBP to £723 GBP, with a median of £405 GBP. At least 19 retailers stock this exact specification, and 79% of the stones appear at more than one of them, with an average price spread of 39%. Half of all listings fall between £683 GBP and £987 GBP per carat. The same specification in lab grown form lists at a median of about £173 GBP per carat. Over the last 30 days the median price moved -6.6% and the number of listings moved +25.3%.

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. Princess natural stones in the index: 2,158 USD per carat, +5.7% 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

279

Lowest Price

£119 GBP

Highest Price

£1,180 GBP

Average Price

£445 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

79.4%

Price Spread

39.4%

30-Day Price Trend

-6.6%

30-Day Supply Change

+25.3%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,026/ct

10th Percentile

$828

Median

$1,026

90th Percentile

$1,561

Score Distribution

683 diamonds scored across 4 quality tiers

Excellent

55 (8.1%)

Very Good

179 (26.2%)

Good

101 (14.8%)

Average

348 (51.0%)

Find Your Diamond

Search 279 F SI1 princess diamonds and compare prices.

Search Diamonds

Consider Instead

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

Lab-Grown F SI1Same specifications, lab-grown origin

Save 74%

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