How much does a 0.50 to 0.74ct I SI1 natural princess diamond cost?

As of October 2026, 0.50 to 0.74ct I SI1 natural princess diamonds typically cost $821 NZD to $1,554 NZD, with a median price of $1,118 NZD. There are currently 369 diamonds matching this specification available across retailers.

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

About 41% of these diamonds are available at multiple retailers, with an average price spread of 26%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct I SI1 Natural Princess

Quick answer

As of October 2026, there are 369 natural princess diamonds with I colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $821 NZD to $1,554 NZD, with a median of $1,118 NZD. At least 58 retailers stock this exact specification, and 41% of the stones appear at more than one of them, with an average price spread of 26%. Half of all listings fall between $1,687 NZD and $2,196 NZD per carat. The same specification in lab grown form lists at a median of about $1,448 NZD per carat. Over the last 30 days the median price moved -0.8% and the number of listings moved +47.8%.

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

369

Lowest Price

$590 NZD

Highest Price

$2,798 NZD

Average Price

$1,218 NZD