How much does a 1.50 to 1.99ct E SI2 natural radiant diamond cost?

As of October 2026, 1.50 to 1.99ct E SI2 natural radiant diamonds typically cost $7,657 NZD to $20,259 NZD, with a median price of $13,685 NZD. There are currently 99 diamonds matching this specification available across retailers.

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

About 33% of these diamonds are available at multiple retailers, with an average price spread of 50%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct E SI2 Natural Radiant

Quick answer

As of October 2026, there are 99 natural radiant diamonds with E colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $7,657 NZD to $20,259 NZD, with a median of $13,685 NZD. At least 51 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 50%. Half of all listings fall between $6,616 NZD and $11,003 NZD per carat. The same specification in lab grown form lists at a median of about $756 NZD per carat. Over the last 30 days the median price moved -1.9% and the number of listings moved +5.8%.

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. 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

$5,633 NZD

Highest Price

$40,481 NZD

Average Price

$14,080 NZD