How much does a 1.00 to 1.49ct I SI2 natural cushion diamond cost?

As of September 2026, 1.00 to 1.49ct I SI2 natural cushion diamonds typically cost $1,457 SGD to $4,478 SGD, with a median price of $2,589 SGD. There are currently 770 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI2 cushion diamond?

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

1.00 to 1.49ct I SI2 Natural Cushion

Quick answer

As of September 2026, there are 770 natural cushion diamonds with I colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,457 SGD to $4,478 SGD, with a median of $2,589 SGD. At least 48 retailers stock this exact specification. Half of all listings fall between $1,991 SGD and $3,579 SGD per carat. The same specification in lab grown form lists at a median of about $1,533 SGD 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. Cushion natural stones in the index: 2,792 USD per carat, +1.1% 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

770

Lowest Price

$897 SGD

Highest Price

$9,866 SGD

Average Price

$2,820 SGD