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

As of September 2026, 1.00 to 1.49ct J SI1 lab grown marquise diamonds typically cost €1,290 EUR to €1,893 EUR, with a median price of €1,376 EUR. There are currently 154 diamonds matching this specification available across retailers.

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

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

1.00 to 1.49ct J SI1 Lab Grown Marquise

Quick answer

As of September 2026, there are 154 lab grown marquise diamonds with J colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run €1,290 EUR to €1,893 EUR, with a median of €1,376 EUR. At least 9 retailers stock this exact specification. Half of all listings fall between €1,264 EUR and €1,291 EUR per carat. The same specification in natural form lists at a median of about €2,726 EUR per carat.

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

1.06ct Marquise J SI1, IGI, score 59 of 100, from €1,925 EUR

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

154

Lowest Price

€1,217 EUR

Highest Price

€4,279 EUR

Average Price

€1,520 EUR

Market Intelligence

Retailers Selling

Price Spread

2.1%

Price Range

Price per carat distribution across retailers

$1,388/ct

10th Percentile

$1,367

Median

$1,388

90th Percentile

$1,556

Score Distribution

154 diamonds scored across 2 quality tiers

Good

125 (81.2%)

Average

29 (18.8%)

Find Your Diamond

Search 154 J SI1 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