How much does a 1.00 to 1.49ct G SI1 natural marquise diamond cost?

As of November 2026, 1.00 to 1.49ct G SI1 natural marquise diamonds typically cost $3,985 AUD to $9,554 AUD, with a median price of $5,694 AUD. There are currently 290 diamonds matching this specification available across retailers.

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

About 35% of these diamonds are available at multiple retailers, with an average price spread of 40%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct G SI1 Natural Marquise

Quick answer

As of November 2026, there are 290 natural marquise diamonds with G colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $3,985 AUD to $9,554 AUD, with a median of $5,694 AUD. At least 64 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 40%. Half of all listings fall between $4,755 AUD and $6,966 AUD per carat. The same specification in lab grown form lists at a median of about $579 AUD per carat. Over the last 30 days the median price moved +0.3% and the number of listings moved +12.9%.

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

290

Lowest Price

$2,564 AUD

Highest Price

$24,707 AUD

Average Price

$6,461 AUD