How much does a 1.00 to 1.49ct I I1 lab grown marquise diamond cost?

As of September 2026, 1.00 to 1.49ct I I1 lab grown marquise diamonds typically cost $1,630 AUD to $4,337 AUD, with a median price of $4,043 AUD. There are currently 13 diamonds matching this specification available across retailers.

Where can I find the best price on a I I1 marquise diamond?

About 5% of these diamonds are available at multiple retailers, with an average price spread of 56%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct I I1 Lab Grown Marquise

Quick answer

As of September 2026, there are 13 lab grown marquise diamonds with I colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,630 AUD to $4,337 AUD, with a median of $4,043 AUD. At least 7 retailers stock this exact specification, and 5% of the stones appear at more than one of them, with an average price spread of 56%. Half of all listings fall between $2,247 AUD and $3,890 AUD per carat. The same specification in natural form lists at a median of about $5,521 AUD per carat.

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

Lowest Price

$1,582 AUD

Highest Price

$5,082 AUD

Average Price

$3,415 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

5.0%

Price Spread

56.5%

Price Range

Price per carat distribution across retailers

$1,892/ct

10th Percentile

$1,009

Median

$1,892

90th Percentile

$2,618

Score Distribution

13 diamonds scored across 2 quality tiers

Good

2 (15.4%)

Average

11 (84.6%)

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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