How much does a 1.50 to 1.99ct E SI2 natural cushion diamond cost?

As of October 2026, 1.50 to 1.99ct E SI2 natural cushion diamonds typically cost $5,220 AUD to $15,128 AUD, with a median price of $8,953 AUD. There are currently 155 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 54%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct E SI2 Natural Cushion

Quick answer

As of October 2026, there are 155 natural cushion diamonds with E colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $5,220 AUD to $15,128 AUD, with a median of $8,953 AUD. At least 53 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 54%. Half of all listings fall between $4,362 AUD and $7,373 AUD per carat. The same specification in lab grown form lists at a median of about $666 AUD per carat. Over the last 30 days the median price moved -2.5% and the number of listings moved +4.8%.

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

155

Lowest Price

$3,584 AUD

Highest Price

$26,170 AUD

Average Price

$9,770 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

30.4%

Price Spread

53.9%

30-Day Price Trend

-2.5%

30-Day Supply Change

+4.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$3,926/ct

10th Percentile

$2,582

Median

$3,926

90th Percentile

$6,454

Score Distribution

479 diamonds scored across 4 quality tiers

Excellent

94 (19.6%)

Very Good

102 (21.3%)

Good

109 (22.8%)

Average

174 (36.3%)

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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 11%

Lab-Grown E SI2Same specifications, lab-grown origin

Save 88%

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