How much does a 1.00 to 1.49ct E SI1 lab grown marquise diamond cost?

As of September 2026, 1.00 to 1.49ct E SI1 lab grown marquise diamonds typically cost €228 EUR to €698 EUR, with a median price of €386 EUR. There are currently 340 diamonds matching this specification available across retailers.

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

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

1.00 to 1.49ct E SI1 Lab Grown Marquise

Quick answer

As of September 2026, there are 340 lab grown marquise diamonds with E colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run €228 EUR to €698 EUR, with a median of €386 EUR. At least 23 retailers stock this exact specification. Half of all listings fall between €277 EUR and €551 EUR per carat. The same specification in natural form lists at a median of about €5,043 EUR 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 lab grown stones in the index: 500 USD per carat, -14.7% 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

340

Lowest Price

€101 EUR

Highest Price

€9,064 EUR

Average Price

€471 EUR

Market Intelligence

Retailers Selling

Price Spread

77.4%

Price Range

Price per carat distribution across retailers

$386/ct

10th Percentile

$261

Median

$386

90th Percentile

$744

Score Distribution

340 diamonds scored across 4 quality tiers

Excellent

25 (7.4%)

Very Good

59 (17.4%)

Good

128 (37.6%)

Average

128 (37.6%)

Find Your Diamond

Search 340 E SI1 marquise diamonds and compare prices.

Search Diamonds

Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

E SI2SI2 inclusions are not visible without magnification

Save 11%

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