How much does a 5.00ct+ G IF lab grown marquise diamond cost?

As of September 2026, 5.00ct+ G IF lab grown marquise diamonds typically cost £7,028 GBP to £9,797 GBP, with a median price of £8,413 GBP. There are currently 2 diamonds matching this specification available across retailers.

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

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5.00ct+ G IF Lab Grown Marquise

Quick answer

As of September 2026, there are 2 lab grown marquise diamonds with G colour and IF clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £7,028 GBP to £9,797 GBP, with a median of £8,413 GBP. At least 25 retailers stock this exact specification. Half of all listings fall between £1,274 GBP and £3,120 GBP per carat. The same specification in natural form lists at a median of about £26,844 GBP per carat.

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

5.25ct Marquise G IF, IGI, score 86 of 100, from £6,682 GBP

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Marquise lab grown stones in the index: 500 USD per carat, -14.7% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

Lowest Price

£6,682 GBP

Highest Price

£63,885 GBP

Average Price

£8,413 GBP

Market Intelligence

Retailers Selling

Price Spread

98.6%

Price Range

Price per carat distribution across retailers

$2,530/ct

10th Percentile

$1,107

Median

$2,530

90th Percentile

$7,670

Score Distribution

2 diamonds scored across 2 quality tiers

Excellent

1 (50.0%)

Very Good

1 (50.0%)

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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