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

As of October 2026, 0.20 to 0.49ct F SI1 natural radiant diamonds typically cost £254 GBP to £699 GBP, with a median price of £407 GBP. There are currently 50 diamonds matching this specification available across retailers.

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

About 25% of these diamonds are available at multiple retailers, with an average price spread of 31%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct F SI1 Natural Radiant

Quick answer

As of October 2026, there are 50 natural radiant diamonds with F colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £254 GBP to £699 GBP, with a median of £407 GBP. At least 11 retailers stock this exact specification, and 25% of the stones appear at more than one of them, with an average price spread of 31%. Half of all listings fall between £1,014 GBP and £1,393 GBP per carat. The same specification in lab grown form lists at a median of about £536 GBP per carat.

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. Radiant natural stones in the index: 3,091 USD per carat, +13.2% 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

Lowest Price

£161 GBP

Highest Price

£1,344 GBP

Average Price

£451 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

25.0%

Price Spread

31.3%

Price Range

Price per carat distribution across retailers

$1,611/ct

10th Percentile

$1,296

Median

$1,611

90th Percentile

$2,354

Score Distribution

158 diamonds scored across 4 quality tiers

Excellent

16 (10.1%)

Very Good

14 (8.9%)

Good

40 (25.3%)

Average

88 (55.7%)

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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 13%

Lab-Grown F SI1Same specifications, lab-grown origin

Save 56%

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