How much does a 0.20 to 0.49ct I SI1 natural oval diamond cost?

As of October 2026, 0.20 to 0.49ct I SI1 natural oval diamonds typically cost $280 USD to $636 USD, with a median price of $421 USD. There are currently 268 diamonds matching this specification available across retailers.

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

About 24% of these diamonds are available at multiple retailers, with an average price spread of 41%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct I SI1 Natural Oval

Quick answer

As of October 2026, there are 268 natural oval diamonds with I color and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $280 USD to $636 USD, with a median of $421 USD. At least 22 retailers stock this exact specification, and 24% of the stones appear at more than one of them, with an average price spread of 41%. Half of all listings fall between $1,054 USD and $1,584 USD per carat. The same specification in lab grown form lists at a median of about $605 USD per carat. Over the last 30 days the median price moved -6.0% and the number of listings moved -9.3%.

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. Oval natural stones in the index: 2,655 USD per carat, +10.2% 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

268

Lowest Price

$149 USD

Highest Price

$1,350 USD

Average Price

$444 USD