How much does a 1.50 to 1.99ct J SI1 lab grown round diamond cost?

As of October 2026, 1.50 to 1.99ct J SI1 lab grown round diamonds typically cost $1,976 NZD to $3,783 NZD, with a median price of $2,350 NZD. There are currently 182 diamonds matching this specification available across retailers.

Where can I find the best price on a J SI1 round diamond?

About 50% 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.

1.50 to 1.99ct J SI1 Lab Grown Round

Quick answer

As of October 2026, there are 182 lab grown round diamonds with J colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $1,976 NZD to $3,783 NZD, with a median of $2,350 NZD. At least 27 retailers stock this exact specification, and 50% of the stones appear at more than one of them, with an average price spread of 68%. Half of all listings fall between $1,449 NZD and $2,534 NZD per carat. The same specification in natural form lists at a median of about $5,615 NZD per carat. Over the last 30 days the median price moved -6.3% and the number of listings moved -4.9%.

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

182

Lowest Price

$529 NZD

Highest Price

$10,635 NZD

Average Price

$2,828 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

49.6%

Price Spread

68.0%

30-Day Price Trend

-6.3%

30-Day Supply Change

-4.9%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$896/ct

10th Percentile

$719

Median

$896

90th Percentile

$1,769

Score Distribution

314 diamonds scored across 4 quality tiers

Excellent

160 (51.0%)

Very Good

10 (3.2%)

Good

133 (42.4%)

Average

11 (3.5%)

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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