How much does a 0.20 to 0.49ct G I1 natural marquise diamond cost?

As of November 2026, 0.20 to 0.49ct G I1 natural marquise diamonds typically cost £209 GBP to £622 GBP, with a median price of £383 GBP. There are currently 14 diamonds matching this specification available across retailers.

Where can I find the best price on a G I1 marquise diamond?

About 45% of these diamonds are available at multiple retailers, with an average price spread of 55%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct G I1 Natural Marquise

Quick answer

As of November 2026, there are 14 natural marquise diamonds with G colour and I1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £209 GBP to £622 GBP, with a median of £383 GBP. At least 12 retailers stock this exact specification, and 45% of the stones appear at more than one of them, with an average price spread of 55%. Half of all listings fall between £765 GBP and £1,291 GBP per carat.

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: November 2026

Available

Lowest Price

£143 GBP

Highest Price

£960 GBP

Average Price

£392 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

45.5%

Price Spread

54.8%

Price Range

Price per carat distribution across retailers

$1,286/ct

10th Percentile

$942

Median

$1,286

90th Percentile

$3,018

Score Distribution

64 diamonds scored across 4 quality tiers

Excellent

3 (4.7%)

Very Good

5 (7.8%)

Good

8 (12.5%)

Average

48 (75.0%)

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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