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

As of October 2026, 1.50 to 1.99ct E SI1 natural marquise diamonds typically cost $9,270 USD to $27,014 USD, with a median price of $13,705 USD. There are currently 62 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 33%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct E SI1 Natural Marquise

Quick answer

As of October 2026, there are 62 natural marquise diamonds with E color and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $9,270 USD to $27,014 USD, with a median of $13,705 USD. At least 60 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 33%. Half of all listings fall between $7,132 USD and $9,874 USD per carat. The same specification in lab grown form lists at a median of about $417 USD per carat. Over the last 30 days the median price moved -0.8% and the number of listings moved +15.4%.

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. Marquise natural stones in the index: 2,268 USD per carat, +10.8% 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

$6,180 USD

Highest Price

$33,470 USD

Average Price

$15,843 USD