How much does a 3.00 to 4.99ct E SI1 natural round diamond cost?

As of October 2026, 3.00 to 4.99ct E SI1 natural round diamonds typically cost $54,061 AUD to $167,422 AUD, with a median price of $87,151 AUD. There are currently 138 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 30%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct E SI1 Natural Round

Quick answer

As of October 2026, there are 138 natural round diamonds with E colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $54,061 AUD to $167,422 AUD, with a median of $87,151 AUD. At least 58 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 30%. Half of all listings fall between $20,758 AUD and $28,054 AUD per carat. The same specification in lab grown form lists at a median of about $499 AUD per carat. Over the last 30 days the median price moved +0.7% and the number of listings moved +6.0%.

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

138

Lowest Price

$33,113 AUD

Highest Price

$253,763 AUD

Average Price

$98,948 AUD