How much does a 1.50 to 1.99ct G SI1 natural marquise diamond cost?

As of November 2026, 1.50 to 1.99ct G SI1 natural marquise diamonds typically cost $10,641 SGD to $28,406 SGD, with a median price of $14,756 SGD. There are currently 84 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 35%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct G SI1 Natural Marquise

Quick answer

As of November 2026, there are 84 natural marquise diamonds with G colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $10,641 SGD to $28,406 SGD, with a median of $14,756 SGD. At least 57 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 35%. Half of all listings fall between $8,513 SGD and $12,000 SGD per carat. The same specification in lab grown form lists at a median of about $576 SGD per carat. Over the last 30 days the median price moved -1.6% and the number of listings moved +12.6%.

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

$6,929 SGD

Highest Price

$36,546 SGD

Average Price

$17,752 SGD