How much does a 1.50 to 1.99ct E SI2 natural round diamond cost?

As of October 2026, 1.50 to 1.99ct E SI2 natural round diamonds typically cost $4,080 USD to $13,620 USD, with a median price of $7,136 USD. There are currently 1,104 diamonds matching this specification available across retailers.

Where can I find the best price on a E SI2 round diamond?

About 38% of these diamonds are available at multiple retailers, with an average price spread of 51%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct E SI2 Natural Round

Quick answer

As of October 2026, there are 1,104 natural round diamonds with E color and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $4,080 USD to $13,620 USD, with a median of $7,136 USD. At least 58 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 51%. Half of all listings fall between $3,885 USD and $6,439 USD per carat. The same specification in lab grown form lists at a median of about $416 USD per carat. Over the last 30 days the median price moved -1.6% and the number of listings moved +12.6%.

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

1,104

Lowest Price

$2,014 USD

Highest Price

$27,687 USD

Average Price

$8,084 USD