How much does a 0.75 to 0.99ct E SI1 natural cushion diamond cost?

As of October 2026, 0.75 to 0.99ct E SI1 natural cushion diamonds typically cost $1,302 AUD to $4,884 AUD, with a median price of $2,534 AUD. There are currently 147 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 81%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct E SI1 Natural Cushion

Quick answer

As of October 2026, there are 147 natural cushion diamonds with E colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,302 AUD to $4,884 AUD, with a median of $2,534 AUD. At least 56 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 81%. Half of all listings fall between $1,961 AUD and $4,406 AUD per carat. The same specification in lab grown form lists at a median of about $766 AUD per carat. Over the last 30 days the median price moved -1.6% and the number of listings moved +3.8%.

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. Cushion natural stones in the index: 2,948 USD per carat, +1.7% 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

147

Lowest Price

$929 AUD

Highest Price

$10,159 AUD

Average Price

$2,831 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

30.4%

Price Spread

80.7%

30-Day Price Trend

-1.6%

30-Day Supply Change

+3.8%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,129/ct

10th Percentile

$1,115

Median

$2,129

90th Percentile

$4,037

Score Distribution

410 diamonds scored across 4 quality tiers

Excellent

59 (14.4%)

Very Good

61 (14.9%)

Good

132 (32.2%)

Average

158 (38.5%)

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Consider Instead

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

Lab-Grown E SI1Same specifications, lab-grown origin

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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