How much does a 0.50 to 0.74ct E SI1 natural round diamond cost?

As of October 2026, 0.50 to 0.74ct E SI1 natural round diamonds typically cost $1,117 NZD to $3,656 NZD, with a median price of $1,945 NZD. There are currently 10,033 diamonds matching this specification available across retailers.

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

About 40% of these diamonds are available at multiple retailers, with an average price spread of 56%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct E SI1 Natural Round

Quick answer

As of October 2026, there are 10,033 natural round diamonds with E colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $1,117 NZD to $3,656 NZD, with a median of $1,945 NZD. At least 70 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 56%. Half of all listings fall between $2,730 NZD and $4,615 NZD per carat. The same specification in lab grown form lists at a median of about $891 NZD per carat. Over the last 30 days the median price moved -3.3% and the number of listings moved +12.6%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

10,033

Lowest Price

$639 NZD

Highest Price

$7,468 NZD

Average Price

$2,199 NZD