How much does a 0.50 to 0.74ct I VS1 lab grown cushion diamond cost?

As of October 2026, 0.50 to 0.74ct I VS1 lab grown cushion diamonds typically cost $324 NZD to $746 NZD, with a median price of $426 NZD. There are currently 10 diamonds matching this specification available across retailers.

Where can I find the best price on a I VS1 cushion diamond?

About 36% of these diamonds are available at multiple retailers, with an average price spread of 68%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct I VS1 Lab Grown Cushion

Quick answer

As of October 2026, there are 10 lab grown cushion diamonds with I colour and VS1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $324 NZD to $746 NZD, with a median of $426 NZD. At least 27 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 68%. Half of all listings fall between $800 NZD and $1,573 NZD per carat. The same specification in natural form lists at a median of about $2,265 NZD per carat. Over the last 30 days the median price moved -8.9% and the number of listings moved +10.1%.

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

Lowest Price

$262 NZD

Highest Price

$2,133 NZD

Average Price

$483 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

36.4%

Price Spread

68.3%

30-Day Price Trend

-8.9%

30-Day Supply Change

+10.1%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$635/ct

10th Percentile

$348

Median

$635

90th Percentile

$1,390

Score Distribution

17 diamonds scored across 4 quality tiers

Excellent

8 (47.1%)

Very Good

1 (5.9%)

Good

6 (35.3%)

Average

2 (11.8%)

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J VS1J colour is visually identical to I to the naked eye

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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