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

As of November 2026, 3.00 to 4.99ct G SI2 lab grown marquise diamonds typically cost €351 EUR to €2,012 EUR, with a median price of €1,148 EUR. 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 91%. 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 November 2026, there are 1 lab grown marquise diamonds with G colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run €351 EUR to €2,012 EUR, with a median of €1,148 EUR. At least 20 retailers stock this exact specification, and 23% of the stones appear at more than one of them, with an average price spread of 91%. Half of all listings fall between €167 EUR and €505 EUR per carat. The same specification in natural form lists at a median of about €13,256 EUR per carat. Over the last 30 days the median price moved +22.9% and the number of listings moved +32.8%.

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

3.03ct Marquise G SI2, IGI, grade A, from €311 EUR

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. Marquise lab grown stones in the index: 505 USD per carat, +1.6% 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

€311 EUR

Highest Price

€2,016 EUR

Average Price

€1,246 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

23.1%

Price Spread

90.7%

30-Day Price Trend

+22.9%

30-Day Supply Change

+32.8%

Volatility (30d)

0.07

Price Range

Price per carat distribution across retailers

$417/ct

10th Percentile

$138

Median

$417

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