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 $436 SGD to $1,182 SGD, with a median price of $694 SGD. There are currently 49 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 34%. 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 49 natural radiant diamonds with F colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $436 SGD to $1,182 SGD, with a median of $694 SGD. 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 34%. Half of all listings fall between $1,677 SGD and $2,378 SGD per carat. The same specification in lab grown form lists at a median of about $916 SGD 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

$275 SGD

Highest Price

$1,966 SGD

Average Price

$763 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

25.0%

Price Spread

33.9%

Price Range

Price per carat distribution across retailers

$1,611/ct

10th Percentile

$1,281

Median

$1,611

90th Percentile

$2,354

Score Distribution

156 diamonds scored across 4 quality tiers

Excellent

15 (9.6%)

Very Good

14 (9.0%)

Good

40 (25.6%)

Average

87 (55.8%)

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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 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