How much does a 0.75 to 0.99ct E SI1 natural radiant diamond cost?

As of October 2026, 0.75 to 0.99ct E SI1 natural radiant diamonds typically cost $2,097 NZD to $5,997 NZD, with a median price of $3,832 NZD. There are currently 75 diamonds matching this specification available across retailers.

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

About 29% of these diamonds are available at multiple retailers, with an average price spread of 57%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct E SI1 Natural Radiant

Quick answer

As of October 2026, there are 75 natural radiant diamonds with E colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $2,097 NZD to $5,997 NZD, with a median of $3,832 NZD. At least 57 retailers stock this exact specification, and 29% of the stones appear at more than one of them, with an average price spread of 57%. Half of all listings fall between $3,365 NZD and $5,871 NZD per carat. The same specification in lab grown form lists at a median of about $767 NZD per carat. Over the last 30 days the median price moved -1.2% and the number of listings moved +12.5%.

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. Radiant natural stones in the index: 3,091 USD per carat, +13.2% 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: October 2026

Available

Lowest Price

$1,135 NZD

Highest Price

$10,511 NZD

Average Price

$4,058 NZD