How much does a 0.20 to 0.49ct G SI1 natural marquise diamond cost?

As of November 2026, 0.20 to 0.49ct G SI1 natural marquise diamonds typically cost €259 EUR to €549 EUR, with a median price of €389 EUR. There are currently 882 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 53%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct G SI1 Natural Marquise

Quick answer

As of November 2026, there are 882 natural marquise diamonds with G colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run €259 EUR to €549 EUR, with a median of €389 EUR. At least 26 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 53%. Half of all listings fall between €1,144 EUR and €1,904 EUR per carat. The same specification in lab grown form lists at a median of about €411 EUR per carat. Over the last 30 days the median price moved -6.1% and the number of listings moved -6.9%.

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

882

Lowest Price

€152 EUR

Highest Price

€1,193 EUR

Average Price

€410 EUR