How much does a 2.00 to 2.99ct I SI2 natural cushion diamond cost?

As of September 2026, 2.00 to 2.99ct I SI2 natural cushion diamonds typically cost $10,050 NZD to $31,995 NZD, with a median price of $17,885 NZD. There are currently 671 diamonds matching this specification available across retailers.

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

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2.00 to 2.99ct I SI2 Natural Cushion

Quick answer

As of September 2026, there are 671 natural cushion diamonds with I colour and SI2 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run $10,050 NZD to $31,995 NZD, with a median of $17,885 NZD. At least 46 retailers stock this exact specification. Half of all listings fall between $6,522 NZD and $11,012 NZD per carat. The same specification in lab grown form lists at a median of about $8,272 NZD 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. Cushion natural stones in the index: 2,792 USD per carat, +1.1% 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

671

Lowest Price

$4,569 NZD

Highest Price

$77,763 NZD

Average Price

$20,048 NZD

Market Intelligence

Retailers Selling

Price Spread

52.5%

Price Range

Price per carat distribution across retailers

$4,919/ct

10th Percentile

$2,991

Median

$4,919

90th Percentile

$7,490

Score Distribution

671 diamonds scored across 4 quality tiers

Excellent

102 (15.2%)

Very Good

224 (33.4%)

Good

177 (26.4%)

Average

168 (25.0%)

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Consider Instead

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

J SI2J colour is visually identical to I to the naked eye

Save 27%

Lab-Grown I SI2Same specifications, lab-grown origin

Save 62%

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