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 €210 EUR to €657 EUR, with a median price of €358 EUR. There are currently 346 diamonds matching this specification available across retailers.

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1.00 to 1.49ct E SI1 Lab Grown Marquise

Quick answer

As of September 2026, there are 346 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 €210 EUR to €657 EUR, with a median of €358 EUR. At least 23 retailers stock this exact specification. Half of all listings fall between €261 EUR and €520 EUR per carat. The same specification in natural form lists at a median of about €4,764 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

346

Lowest Price

€95 EUR

Highest Price

€8,564 EUR

Average Price

€441 EUR

Market Intelligence

Retailers Selling

Price Spread

78.0%

Price Range

Price per carat distribution across retailers

$384/ct

10th Percentile

$259

Median

$384

90th Percentile

$743

Score Distribution

346 diamonds scored across 4 quality tiers

Excellent

27 (7.8%)

Very Good

61 (17.6%)

Good

128 (37.0%)

Average

130 (37.6%)

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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