How much does a 1.00 to 1.49ct H SI2 natural marquise diamond cost?

As of November 2026, 1.00 to 1.49ct H SI2 natural marquise diamonds typically cost £1,163 GBP to £3,419 GBP, with a median price of £1,984 GBP. There are currently 575 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI2 marquise diamond?

About 41% of these diamonds are available at multiple retailers, with an average price spread of 54%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct H SI2 Natural Marquise

Quick answer

As of November 2026, there are 575 natural marquise diamonds with H colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,163 GBP to £3,419 GBP, with a median of £1,984 GBP. At least 56 retailers stock this exact specification, and 41% of the stones appear at more than one of them, with an average price spread of 54%. Half of all listings fall between £1,552 GBP and £2,646 GBP per carat. Over the last 30 days the median price moved +0.4% and the number of listings moved +17.7%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Marquise natural stones in the index: 2,177 USD per carat, -4.2% 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

575

Lowest Price

£650 GBP

Highest Price

£9,601 GBP

Average Price

£2,206 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

41.2%

Price Spread

54.1%

30-Day Price Trend

+0.4%

30-Day Supply Change

+17.7%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,710/ct

10th Percentile

$1,622

Median

$2,710

90th Percentile

$4,592

Score Distribution

1.3K diamonds scored across 4 quality tiers

Excellent

264 (21.1%)

Very Good

380 (30.3%)

Good

289 (23.0%)

Average

321 (25.6%)

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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