How much does a 1.00 to 1.49ct H SI1 natural marquise diamond cost?

As of September 2026, 1.00 to 1.49ct H SI1 natural marquise diamonds typically cost £1,856 GBP to £4,668 GBP, with a median price of £2,818 GBP. There are currently 772 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct H SI1 Natural Marquise

Quick answer

As of September 2026, there are 772 natural marquise diamonds with H colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,856 GBP to £4,668 GBP, with a median of £2,818 GBP. At least 60 retailers stock this exact specification. Half of all listings fall between £2,090 GBP and £3,129 GBP per carat. The same specification in lab grown form lists at a median of about £1,043 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

772

Lowest Price

£880 GBP

Highest Price

£12,713 GBP

Average Price

£3,072 GBP

Market Intelligence

Retailers Selling

Price Spread

40.4%

Price Range

Price per carat distribution across retailers

$3,434/ct

10th Percentile

$2,291

Median

$3,434

90th Percentile

$4,989

Score Distribution

772 diamonds scored across 4 quality tiers

Excellent

25 (3.2%)

Very Good

135 (17.5%)

Good

272 (35.2%)

Average

340 (44.0%)

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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

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Lab-Grown H SI1Same specifications, lab-grown origin

Save 61%

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