How much does a 5.00ct+ H SI1 natural marquise diamond cost?

As of September 2026, 5.00ct+ H SI1 natural marquise diamonds typically cost $124,743 USD to $214,407 USD, with a median price of $175,293 USD. There are currently 7 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI1 marquise diamond?

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5.00ct+ H SI1 Natural Marquise

Quick answer

As of September 2026, there are 7 natural marquise diamonds with H color and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $124,743 USD to $214,407 USD, with a median of $175,293 USD. At least 10 retailers stock this exact specification. Half of all listings fall between $21,745 USD and $26,588 USD per carat. The same specification in lab grown form lists at a median of about $542 USD 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

$111,926 USD

Highest Price

$219,830 USD

Average Price

$171,353 USD

Market Intelligence

Retailers Selling

Price Spread

19.9%

Price Range

Price per carat distribution across retailers

$24,394/ct

10th Percentile

$17,570

Median

$24,394

90th Percentile

$31,138

Score Distribution

7 diamonds scored across 3 quality tiers

Very Good

1 (14.3%)

Good

3 (42.9%)

Average

3 (42.9%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

H SI2SI2 inclusions are not visible without magnification

Save 4%

Lab-Grown H SI1Same specifications, lab-grown origin

Save 98%

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