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 $6,521 NZD to $18,838 NZD, with a median price of $11,178 NZD. There are currently 150 diamonds matching this specification available across retailers.

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

About 31% 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 150 natural cushion diamonds with E colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $6,521 NZD to $18,838 NZD, with a median of $11,178 NZD. At least 53 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 54%. Half of all listings fall between $5,457 NZD and $9,237 NZD per carat. The same specification in lab grown form lists at a median of about $833 NZD per carat. Over the last 30 days the median price moved -2.6% and the number of listings moved +4.4%.

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

150

Lowest Price

$4,483 NZD

Highest Price

$32,735 NZD

Average Price

$12,194 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

30.6%

Price Spread

53.9%

30-Day Price Trend

-2.6%

30-Day Supply Change

+4.4%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$3,936/ct

10th Percentile

$2,583

Median

$3,936

90th Percentile

$6,460

Score Distribution

453 diamonds scored across 4 quality tiers

Excellent

92 (20.3%)

Very Good

89 (19.6%)

Good

101 (22.3%)

Average

171 (37.7%)

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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