How much does a 2.00 to 2.99ct I SI1 lab grown marquise diamond cost?

As of September 2026, 2.00 to 2.99ct I SI1 lab grown marquise diamonds typically cost $4,869 AUD to $7,092 AUD, with a median price of $6,035 AUD. There are currently 70 diamonds matching this specification available across retailers.

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

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

2.00 to 2.99ct I SI1 Lab Grown Marquise

Quick answer

As of September 2026, there are 70 lab grown marquise diamonds with I colour and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run $4,869 AUD to $7,092 AUD, with a median of $6,035 AUD. At least 15 retailers stock this exact specification. Half of all listings fall between $2,395 AUD and $2,656 AUD per carat. The same specification in natural form lists at a median of about $17,539 AUD 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

Lowest Price

$445 AUD

Highest Price

$54,892 AUD

Average Price

$7,169 AUD

Market Intelligence

Retailers Selling

Price Spread

10.8%

Price Range

Price per carat distribution across retailers

$1,568/ct

10th Percentile

$1,099

Median

$1,568

90th Percentile

$3,684

Score Distribution

70 diamonds scored across 3 quality tiers

Very Good

5 (7.1%)

Good

62 (88.6%)

Average

3 (4.3%)

Find Your Diamond

Search 70 I 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