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

As of November 2026, 3.00 to 4.99ct G SI1 lab grown marquise diamonds typically cost $1,460 AUD to $5,024 AUD, with a median price of $2,411 AUD. There are currently 26 diamonds matching this specification available across retailers.

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

About 28% of these diamonds are available at multiple retailers, with an average price spread of 114%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct G SI1 Lab Grown Marquise

Quick answer

As of November 2026, there are 26 lab grown marquise diamonds with G colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $1,460 AUD to $5,024 AUD, with a median of $2,411 AUD. At least 31 retailers stock this exact specification, and 28% of the stones appear at more than one of them, with an average price spread of 114%. Half of all listings fall between $357 AUD and $1,127 AUD per carat. The same specification in natural form lists at a median of about $28,197 AUD per carat. Over the last 30 days the median price moved +27.4% and the number of listings moved +36.1%.

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. Marquise lab grown stones in the index: 485 USD per carat, -3.2% 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

$524 AUD

Highest Price

$8,680 AUD

Average Price

$2,964 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

27.9%

Price Spread

114.0%

30-Day Price Trend

+27.4%

30-Day Supply Change

+36.1%

Volatility (30d)

0.08

Price Range

Price per carat distribution across retailers

$475/ct

10th Percentile

$148

Median

$475

90th Percentile

$1,074

Score Distribution

113 diamonds scored across 4 quality tiers

Excellent

11 (9.7%)

Very Good

2 (1.8%)

Good

25 (22.1%)

Average

75 (66.4%)

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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