How much does a 1.50 to 1.99ct I VS1 lab grown round diamond cost?

As of October 2026, 1.50 to 1.99ct I VS1 lab grown round diamonds typically cost $664 NZD to $6,143 NZD, with a median price of $1,414 NZD. There are currently 650 diamonds matching this specification available across retailers.

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

About 29% of these diamonds are available at multiple retailers, with an average price spread of 139%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I VS1 Lab Grown Round

Quick answer

As of October 2026, there are 650 lab grown round diamonds with I colour and VS1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $664 NZD to $6,143 NZD, with a median of $1,414 NZD. At least 40 retailers stock this exact specification, and 29% of the stones appear at more than one of them, with an average price spread of 139%. Half of all listings fall between $541 NZD and $1,760 NZD per carat. The same specification in natural form lists at a median of about $10,061 NZD per carat. Over the last 30 days the median price moved -6.3% and the number of listings moved +0.8%.

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. Round lab grown stones in the index: 414 USD per carat, -5.0% 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

650

Lowest Price

$403 NZD

Highest Price

$12,123 NZD

Average Price

$2,209 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

29.1%

Price Spread

138.5%

30-Day Price Trend

-6.3%

30-Day Supply Change

+0.8%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$494/ct

10th Percentile

$243

Median

$494

90th Percentile

$1,389

Score Distribution

1.6K diamonds scored across 4 quality tiers

Excellent

379 (23.6%)

Very Good

425 (26.5%)

Good

391 (24.4%)

Average

408 (25.5%)

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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