How much does a 1.50 to 1.99ct D SI1 lab grown cushion diamond cost?

As of October 2026, 1.50 to 1.99ct D SI1 lab grown cushion diamonds typically cost $474 NZD to $2,940 NZD, with a median price of $1,150 NZD. There are currently 177 diamonds matching this specification available across retailers.

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

About 29% of these diamonds are available at multiple retailers, with an average price spread of 97%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D SI1 Lab Grown Cushion

Quick answer

As of October 2026, there are 177 lab grown cushion diamonds with D colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $474 NZD to $2,940 NZD, with a median of $1,150 NZD. At least 41 retailers stock this exact specification, and 29% of the stones appear at more than one of them, with an average price spread of 97%. Half of all listings fall between $491 NZD and $1,225 NZD per carat. The same specification in natural form lists at a median of about $8,982 NZD per carat. Over the last 30 days the median price moved +2.8% and the number of listings moved +12.7%.

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 lab grown stones in the index: 516 USD per carat, +6.9% 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

177

Lowest Price

$353 NZD

Highest Price

$5,509 NZD

Average Price

$1,445 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

28.8%

Price Spread

96.9%

30-Day Price Trend

+2.8%

30-Day Supply Change

+12.7%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$427/ct

10th Percentile

$204

Median

$427

90th Percentile

$943

Score Distribution

390 diamonds scored across 4 quality tiers

Excellent

98 (25.1%)

Very Good

84 (21.5%)

Good

54 (13.8%)

Average

154 (39.5%)

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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