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

As of November 2026, 2.00 to 2.99ct G SI1 natural marquise diamonds typically cost $21,820 AUD to $65,845 AUD, with a median price of $31,671 AUD. There are currently 70 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 25%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct G SI1 Natural Marquise

Quick answer

As of November 2026, there are 70 natural marquise diamonds with G colour and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run $21,820 AUD to $65,845 AUD, with a median of $31,671 AUD. At least 60 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 25%. Half of all listings fall between $14,550 AUD and $18,784 AUD per carat. The same specification in lab grown form lists at a median of about $779 AUD per carat. Over the last 30 days the median price moved -3.6% and the number of listings moved +21.4%.

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

$15,751 AUD

Highest Price

$113,544 AUD

Average Price

$39,502 AUD