How much does a 3.00 to 4.99ct G SI1 lab grown round diamond cost?

As of October 2026, 3.00 to 4.99ct G SI1 lab grown round diamonds typically cost $1,370 NZD to $4,208 NZD, with a median price of $2,390 NZD. There are currently 143 diamonds matching this specification available across retailers.

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

About 22% of these diamonds are available at multiple retailers, with an average price spread of 70%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct G SI1 Lab Grown Round

Quick answer

As of October 2026, there are 143 lab grown round diamonds with G colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $1,370 NZD to $4,208 NZD, with a median of $2,390 NZD. At least 37 retailers stock this exact specification, and 22% of the stones appear at more than one of them, with an average price spread of 70%. Half of all listings fall between $424 NZD and $926 NZD per carat. The same specification in natural form lists at a median of about $31,455 NZD per carat. Over the last 30 days the median price moved +17.4% and the number of listings moved +0.1%.

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. 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

143

Lowest Price

$563 NZD

Highest Price

$9,302 NZD

Average Price

$2,659 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

22.0%

Price Spread

70.1%

30-Day Price Trend

+17.4%

30-Day Supply Change

+0.1%

Volatility (30d)

0.07

Price Range

Price per carat distribution across retailers

$402/ct

10th Percentile

$148

Median

$402

90th Percentile

$690

Score Distribution

752 diamonds scored across 4 quality tiers

Excellent

83 (11.0%)

Very Good

39 (5.2%)

Good

62 (8.2%)

Average

568 (75.5%)

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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