How much does a 5.00ct+ G SI1 lab grown heart diamond cost?

As of November 2026, 5.00ct+ G SI1 lab grown heart diamonds typically cost $1,574 NZD to $17,270 NZD, with a median price of $6,900 NZD. There are currently 14 diamonds matching this specification available across retailers.

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

About 57% of these diamonds are available at multiple retailers, with an average price spread of 69%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ G SI1 Lab Grown Heart

Quick answer

As of November 2026, there are 14 lab grown heart diamonds with G colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $1,574 NZD to $17,270 NZD, with a median of $6,900 NZD. At least 11 retailers stock this exact specification, and 57% of the stones appear at more than one of them, with an average price spread of 69%. Half of all listings fall between $586 NZD and $1,389 NZD per carat. Over the last 30 days the median price moved -9.9% and the number of listings moved +29.6%.

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

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Heart lab grown stones in the index: 428 USD per carat, +1.4% 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: November 2026

Available

Lowest Price

$1,199 NZD

Highest Price

$67,113 NZD

Average Price

$8,509 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

57.1%

Price Spread

68.9%

30-Day Price Trend

-9.9%

30-Day Supply Change

+29.6%

Volatility (30d)

0.04

Price Range

Price per carat distribution across retailers

$656/ct

10th Percentile

$285

Median

$656

90th Percentile

$794

Score Distribution

18 diamonds scored across 4 quality tiers

Excellent

5 (27.8%)

Very Good

7 (38.9%)

Good

1 (5.6%)

Average

5 (27.8%)

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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