How much does a 0.50 to 0.74ct I IF natural marquise diamond cost?

As of October 2026, 0.50 to 0.74ct I IF natural marquise diamonds typically cost £477 GBP to £1,284 GBP, with a median price of £673 GBP. There are currently 87 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 50%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct I IF Natural Marquise

Quick answer

As of October 2026, there are 87 natural marquise diamonds with I colour and IF clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run £477 GBP to £1,284 GBP, with a median of £673 GBP. At least 57 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 50%. Half of all listings fall between £1,217 GBP and £1,975 GBP per carat. Over the last 30 days the median price moved -2.5% and the number of listings moved +4.7%.

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 natural stones in the index: 2,268 USD per carat, +10.8% 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

£311 GBP

Highest Price

£3,155 GBP

Average Price

£777 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

33.7%

Price Spread

50.5%

30-Day Price Trend

-2.5%

30-Day Supply Change

+4.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,996/ct

10th Percentile

$1,381

Median

$1,996

90th Percentile

$3,701

Score Distribution

223 diamonds scored across 4 quality tiers

Excellent

62 (27.8%)

Very Good

72 (32.3%)

Good

60 (26.9%)

Average

29 (13.0%)

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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