How much does a 0.20 to 0.49ct G SI2 natural radiant diamond cost?

As of October 2026, 0.20 to 0.49ct G SI2 natural radiant diamonds typically cost £263 GBP to £685 GBP, with a median price of £404 GBP. There are currently 22 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI2 radiant diamond?

About 19% 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.

0.20 to 0.49ct G SI2 Natural Radiant

Quick answer

As of October 2026, there are 22 natural radiant diamonds with G colour and SI2 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £263 GBP to £685 GBP, with a median of £404 GBP. At least 33 retailers stock this exact specification, and 19% of the stones appear at more than one of them, with an average price spread of 40%. Half of all listings fall between £866 GBP and £1,288 GBP per carat. The same specification in lab grown form lists at a median of about £579 GBP per carat. Over the last 30 days the median price moved -2.0% and the number of listings moved -0.9%.

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

£159 GBP

Highest Price

£961 GBP

Average Price

£434 GBP