How much does a 3.00 to 4.99ct I IF natural marquise diamond cost?

As of September 2026, 3.00 to 4.99ct I IF natural marquise diamonds typically cost $63,235 AUD to $82,999 AUD, with a median price of $63,377 AUD. There are currently 3 diamonds matching this specification available across retailers.

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

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

3.00 to 4.99ct I IF Natural Marquise

Quick answer

As of September 2026, there are 3 natural marquise diamonds with I colour and IF clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $63,235 AUD to $82,999 AUD, with a median of $63,377 AUD. At least 15 retailers stock this exact specification. Half of all listings fall between $21,206 AUD and $25,892 AUD per carat. The same specification in lab grown form lists at a median of about $2,507 AUD per carat.

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

4.51ct Marquise I IF, IGI, score 77 of 100, from $87,904 AUD

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

$63,200 AUD

Highest Price

$146,262 AUD

Average Price

$71,494 AUD