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

As of October 2026, 1.00 to 1.49ct G SI2 lab grown marquise diamonds typically cost £384 GBP to £767 GBP, with a median price of £418 GBP. There are currently 3 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

1.00 to 1.49ct G SI2 Lab Grown Marquise

Quick answer

As of October 2026, there are 3 lab grown marquise diamonds with G colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £384 GBP to £767 GBP, with a median of £418 GBP. The same specification in natural form lists at a median of about £2,799 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

£375 GBP

Highest Price

£855 GBP

Average Price

£549 GBP

Score Distribution

3 diamonds scored across 2 quality tiers

Good

2 (66.7%)

Average

1 (33.3%)

Find Your Diamond

Search 3 G SI2 marquise diamonds and compare prices.

Search Diamonds

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