How much does a 1.50 to 1.99ct I SI2 natural princess diamond cost?

As of October 2026, 1.50 to 1.99ct I SI2 natural princess diamonds typically cost $3,893 SGD to $10,359 SGD, with a median price of $6,275 SGD. There are currently 127 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 53%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I SI2 Natural Princess

Quick answer

As of October 2026, there are 127 natural princess diamonds with I colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $3,893 SGD to $10,359 SGD, with a median of $6,275 SGD. At least 52 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 53%. Half of all listings fall between $3,041 SGD and $5,163 SGD per carat. The same specification in lab grown form lists at a median of about $1,101 SGD per carat. Over the last 30 days the median price moved -2.4% and the number of listings moved +5.7%.

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

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Princess natural stones in the index: 2,158 USD per carat, +5.7% 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: October 2026

Available

127

Lowest Price

$2,521 SGD

Highest Price

$20,305 SGD

Average Price

$6,814 SGD