How much does a 1.00 to 1.49ct E SI1 natural round diamond cost?

As of September 2026, 1.00 to 1.49ct E SI1 natural round diamonds typically cost $3,390 AUD to $8,882 AUD, with a median price of $4,968 AUD. There are currently 5,707 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

1.00 to 1.49ct E SI1 Natural Round

Quick answer

As of September 2026, there are 5,707 natural round diamonds with E colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $3,390 AUD to $8,882 AUD, with a median of $4,968 AUD. At least 68 retailers stock this exact specification. Half of all listings fall between $4,280 AUD and $6,153 AUD per carat. The same specification in lab grown form lists at a median of about $547 AUD per carat.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Round natural stones in the index: 2,094 USD per carat, -3.8% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

5,707

Lowest Price

$653 AUD

Highest Price

$46,986 AUD

Average Price

$5,672 AUD