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 $1,975 AUD to $2,886 AUD, with a median price of $2,107 AUD. There are currently 146 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct J SI1 Lab Grown Marquise

Quick answer

As of September 2026, there are 146 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 $1,975 AUD to $2,886 AUD, with a median of $2,107 AUD. At least 9 retailers stock this exact specification. Half of all listings fall between $1,934 AUD and $2,020 AUD per carat. The same specification in natural form lists at a median of about $4,142 AUD per carat.

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

1.06ct Marquise J SI1, IGI, score 59 of 100, from $2,947 AUD

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

146

Lowest Price

$1,862 AUD

Highest Price

$6,551 AUD

Average Price

$2,317 AUD

Market Intelligence

Retailers Selling

Price Spread

4.4%

Price Range

Price per carat distribution across retailers

$1,388/ct

10th Percentile

$1,367

Median

$1,388

90th Percentile

$1,573

Score Distribution

146 diamonds scored across 2 quality tiers

Good

123 (84.2%)

Average

23 (15.8%)

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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