How much does a 1.00 to 1.49ct G I1 lab grown round diamond cost?

As of September 2026, 1.00 to 1.49ct G I1 lab grown round diamonds typically cost $1,935 NZD to $9,708 NZD, with a median price of $5,953 NZD. There are currently 96 diamonds matching this specification available across retailers.

Where can I find the best price on a G I1 round diamond?

About 32% of these diamonds are available at multiple retailers, with an average price spread of 75%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct G I1 Lab Grown Round

Quick answer

As of September 2026, there are 96 lab grown round diamonds with G colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,935 NZD to $9,708 NZD, with a median of $5,953 NZD. At least 21 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 75%. Half of all listings fall between $2,437 NZD and $5,043 NZD per carat. The same specification in natural form lists at a median of about $4,060 NZD per carat. Over the last 30 days the median price moved -24.5% and the number of listings moved -68.0%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Round lab grown stones in the index: 438 USD per carat, -14.1% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

Lowest Price

$245 NZD

Highest Price

$14,131 NZD

Average Price

$6,020 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

32.4%

Price Spread

75.2%

30-Day Price Trend

-24.5%

30-Day Supply Change

-68.0%

Volatility (30d)

0.07

Price Range

Price per carat distribution across retailers

$1,996/ct

10th Percentile

$577

Median

$1,996

90th Percentile

$4,192

Score Distribution

96 diamonds scored across 4 quality tiers

Excellent

2 (2.1%)

Very Good

23 (24.0%)

Good

27 (28.1%)

Average

44 (45.8%)

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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