How much does a 5.00ct+ G SI1 natural marquise diamond cost?

As of September 2026, 5.00ct+ G SI1 natural marquise diamonds typically cost $179,234 CAD to $670,766 CAD, with a median price of $261,356 CAD. There are currently 7 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

5.00ct+ G SI1 Natural Marquise

Quick answer

As of September 2026, there are 7 natural marquise diamonds with G color and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $179,234 CAD to $670,766 CAD, with a median of $261,356 CAD. At least 11 retailers stock this exact specification. Half of all listings fall between $50,241 CAD and $58,420 CAD per carat. The same specification in lab grown form lists at a median of about $493 CAD 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

Lowest Price

$125,098 CAD

Highest Price

$758,133 CAD

Average Price

$396,846 CAD