How much does a 1.50 to 1.99ct E SI1 natural round diamond cost?

As of October 2026, 1.50 to 1.99ct E SI1 natural round diamonds typically cost $6,533 USD to $17,777 USD, with a median price of $9,980 USD. There are currently 874 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 46%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct E SI1 Natural Round

Quick answer

As of October 2026, there are 874 natural round diamonds with E color and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $6,533 USD to $17,777 USD, with a median of $9,980 USD. At least 65 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 46%. Half of all listings fall between $5,460 USD and $8,516 USD per carat. The same specification in lab grown form lists at a median of about $394 USD per carat. Over the last 30 days the median price moved -1.3% and the number of listings moved +11.9%.

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. 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

874

Lowest Price

$3,524 USD

Highest Price

$30,669 USD

Average Price

$11,282 USD