How much does a 5.00ct+ I IF natural marquise diamond cost?

As of September 2026, 5.00ct+ I IF natural marquise diamonds typically cost £93,245 GBP to £148,575 GBP, with a median price of £118,180 GBP. There are currently 11 diamonds matching this specification available across retailers.

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

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5.00ct+ I IF Natural Marquise

Quick answer

As of September 2026, there are 11 natural marquise diamonds with I colour and IF clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £93,245 GBP to £148,575 GBP, with a median of £118,180 GBP. At least 8 retailers stock this exact specification. Half of all listings fall between £15,009 GBP and £18,752 GBP per carat.

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

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 natural stones in the index: 2,114 USD per carat, -8.8% 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

£86,158 GBP

Highest Price

£168,130 GBP

Average Price

£119,758 GBP

Market Intelligence

Retailers Selling

Price Spread

21.9%

Price Range

Price per carat distribution across retailers

$21,682/ct

10th Percentile

$18,989

Median

$21,682

90th Percentile

$27,661

Score Distribution

11 diamonds scored across 4 quality tiers

Excellent

2 (18.2%)

Very Good

1 (9.1%)

Good

6 (54.5%)

Average

2 (18.2%)

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J IFJ colour is visually identical to I to the naked eye

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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