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 £1,858 GBP to £4,657 GBP, with a median price of £2,832 GBP. There are currently 741 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 741 natural marquise diamonds with H colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,858 GBP to £4,657 GBP, with a median of £2,832 GBP. At least 58 retailers stock this exact specification. Half of all listings fall between £2,099 GBP and £3,106 GBP per carat. The same specification in lab grown form lists at a median of about £1,040 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

741

Lowest Price

£878 GBP

Highest Price

£12,683 GBP

Average Price

£3,077 GBP

Market Intelligence

Retailers Selling

Price Spread

39.2%

Price Range

Price per carat distribution across retailers

$3,439/ct

10th Percentile

$2,290

Median

$3,439

90th Percentile

$4,927

Score Distribution

741 diamonds scored across 4 quality tiers

Excellent

21 (2.8%)

Very Good

128 (17.3%)

Good

262 (35.4%)

Average

330 (44.5%)

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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 24%

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