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

As of September 2026, 2.00 to 2.99ct I SI1 natural marquise diamonds typically cost €10,577 EUR to €26,069 EUR, with a median price of €15,430 EUR. There are currently 173 diamonds matching this specification available across retailers.

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

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2.00 to 2.99ct I SI1 Natural Marquise

Quick answer

As of September 2026, there are 173 natural marquise diamonds with I colour and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run €10,577 EUR to €26,069 EUR, with a median of €15,430 EUR. At least 49 retailers stock this exact specification. Half of all listings fall between €7,309 EUR and €10,013 EUR per carat. The same specification in lab grown form lists at a median of about €1,423 EUR per carat.

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

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Marquise natural stones in the index: 2,114 USD per carat, -8.8% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

173

Lowest Price

€7,315 EUR

Highest Price

€66,974 EUR

Average Price

€17,635 EUR