How much does a 2.00 to 2.99ct I SI1 natural marquise diamond cost?

As of November 2026, 2.00 to 2.99ct I SI1 natural marquise diamonds typically cost €12,489 EUR to €39,216 EUR, with a median price of €19,277 EUR. There are currently 61 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 27%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct I SI1 Natural Marquise

Quick answer

As of November 2026, there are 61 natural marquise diamonds with I colour and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run €12,489 EUR to €39,216 EUR, with a median of €19,277 EUR. At least 58 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 27%. Half of all listings fall between €7,455 EUR and €9,766 EUR per carat. The same specification in lab grown form lists at a median of about €582 EUR per carat. Over the last 30 days the median price moved -3.1% and the number of listings moved +24.2%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Marquise natural stones in the index: 2,177 USD per carat, -4.2% 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: November 2026

Available

Lowest Price

€6,097 EUR

Highest Price

€57,782 EUR

Average Price

€23,234 EUR