How much does a 3.00 to 4.99ct G SI2 lab grown marquise diamond cost?

As of October 2026, 3.00 to 4.99ct G SI2 lab grown marquise diamonds typically cost $393 USD to $2,249 USD, with a median price of $1,284 USD. There are currently 1 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI2 marquise diamond?

About 23% of these diamonds are available at multiple retailers, with an average price spread of 90%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct G SI2 Lab Grown Marquise

Quick answer

As of October 2026, there are 1 lab grown marquise diamonds with G color and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $393 USD to $2,249 USD, with a median of $1,284 USD. At least 19 retailers stock this exact specification, and 23% of the stones appear at more than one of them, with an average price spread of 90%. Half of all listings fall between $202 USD and $575 USD per carat. The same specification in natural form lists at a median of about $10,888 USD per carat. Over the last 30 days the median price moved +22.7% and the number of listings moved +44.0%.

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

3.03ct Marquise G SI2, IGI, grade A, from $348 USD

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: October 2026

Available

Lowest Price

$348 USD

Highest Price

$2,254 USD

Average Price

$1,393 USD

Market Intelligence

Retailers Selling

Cross Retailer %

23.1%

Price Spread

89.6%

30-Day Price Trend

+22.7%

30-Day Supply Change

+44.0%

Volatility (30d)

0.09

Price Range

Price per carat distribution across retailers

$415/ct

10th Percentile

$137

Median

$415

90th Percentile

$785

Score Distribution

9 diamonds scored across 3 quality tiers

Excellent

2 (22.2%)

Good

1 (11.1%)

Average

6 (66.7%)

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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