How much does a 1.00 to 1.49ct F SI2 lab grown marquise diamond cost?

As of October 2026, 1.00 to 1.49ct F SI2 lab grown marquise diamonds typically cost £268 GBP to £476 GBP, with a median price of £343 GBP. There are currently 4 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct F SI2 Lab Grown Marquise

Quick answer

As of October 2026, there are 4 lab grown marquise diamonds with F colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £268 GBP to £476 GBP, with a median of £343 GBP. The same specification in natural form lists at a median of about £2,817 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 lab grown stones in the index: 485 USD per carat, -3.2% 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: October 2026

Available

Lowest Price

£184 GBP

Highest Price

£734 GBP

Average Price

£359 GBP

Score Distribution

10 diamonds scored across 3 quality tiers

Very Good

2 (20.0%)

Good

3 (30.0%)

Average

5 (50.0%)

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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