How much does a 1.00 to 1.49ct E SI2 natural radiant diamond cost?

As of September 2026, 1.00 to 1.49ct E SI2 natural radiant diamonds typically cost $2,279 AUD to $7,347 AUD, with a median price of $3,891 AUD. There are currently 594 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct E SI2 Natural Radiant

Quick answer

As of September 2026, there are 594 natural radiant diamonds with E colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,279 AUD to $7,347 AUD, with a median of $3,891 AUD. At least 49 retailers stock this exact specification. Half of all listings fall between $2,833 AUD and $4,673 AUD per carat. The same specification in lab grown form lists at a median of about $971 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. Radiant natural stones in the index: 2,765 USD per carat, +6.0% 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

594

Lowest Price

$542 AUD

Highest Price

$11,731 AUD

Average Price

$4,447 AUD

Market Intelligence

Retailers Selling

Price Spread

51.9%

Price Range

Price per carat distribution across retailers

$2,546/ct

10th Percentile

$1,706

Median

$2,546

90th Percentile

$4,224

Score Distribution

594 diamonds scored across 4 quality tiers

Excellent

90 (15.2%)

Very Good

166 (27.9%)

Good

161 (27.1%)

Average

177 (29.8%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

F SI2F colour is visually identical to E to the naked eye

Save 9%

Lab-Grown E SI2Same specifications, lab-grown origin

Save 73%

Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1