How much does a 0.20 to 0.49ct G SI1 natural round diamond cost?

As of October 2026, 0.20 to 0.49ct G SI1 natural round diamonds typically cost $305 USD to $949 USD, with a median price of $521 USD. There are currently 13,333 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI1 round diamond?

About 33% of these diamonds are available at multiple retailers, with an average price spread of 57%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct G SI1 Natural Round

Quick answer

As of October 2026, there are 13,333 natural round diamonds with G color and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $305 USD to $949 USD, with a median of $521 USD. At least 37 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 57%. Half of all listings fall between $1,189 USD and $2,050 USD per carat. The same specification in lab grown form lists at a median of about $854 USD per carat. Over the last 30 days the median price moved -5.4% and the number of listings moved +8.0%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

13,333

Lowest Price

$119 USD

Highest Price

$2,265 USD

Average Price

$583 USD