How much does a 1.50 - 1.99ct I SI1 lab grown round diamond cost?

As of April 2026, 1.50 - 1.99ct I SI1 lab grown round diamonds are available from $108 NZD to $191,317 NZD, with an average price of $4,528 NZD. There are currently 7,470 diamonds matching this specification available across retailers.

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1.50 - 1.99ct I SI1 Lab Grown Round

As of April 2026, there are 7,470 lab grown round diamonds with I color and SI1 clarity in the 1.50 - 1.99ct range available across retailers worldwide. Prices range from $108 NZD to $191,317 NZD, with an average of $4,528 NZD.

Last updated: April 2026

Available

7,470

Lowest Price

$108 NZD

Highest Price

$191,317 NZD

Average Price

$4,528 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

N/A

Price Spread

123.3%

30-Day Price Trend

N/A

30-Day Supply Change

N/A

Volatility (30d)

N/A

Price Range

Price per carat distribution across retailers

$1,955/ct

10th Percentile

$1,411

Median

$1,955

90th Percentile

$5,966

Score Distribution

7.5K diamonds scored across 4 quality tiers

Excellent

1,229 (16.5%)

Very Good

3,793 (50.8%)

Good

1,514 (20.3%)

Average

934 (12.5%)

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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