How much does a 1.00 to 1.49ct I SI2 lab grown marquise diamond cost?

As of September 2026, 1.00 to 1.49ct I SI2 lab grown marquise diamonds typically cost $1,647 NZD to $6,436 NZD, with a median price of $3,046 NZD. There are currently 22 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI2 marquise diamond?

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

1.00 to 1.49ct I SI2 Lab Grown Marquise

Quick answer

As of September 2026, there are 22 lab grown marquise diamonds with I colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,647 NZD to $6,436 NZD, with a median of $3,046 NZD. At least 7 retailers stock this exact specification. Half of all listings fall between $2,528 NZD and $4,754 NZD per carat. The same specification in natural form lists at a median of about $5,078 NZD per carat.

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

1.00ct Marquise I SI2, IGI, score 78 of 100, from $1,582 NZD

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

$1,549 NZD

Highest Price

$7,060 NZD

Average Price

$3,623 NZD

Market Intelligence

Retailers Selling

Price Spread

74.5%

Price Range

Price per carat distribution across retailers

$1,793/ct

10th Percentile

$1,077

Median

$1,793

90th Percentile

$3,846

Score Distribution

22 diamonds scored across 3 quality tiers

Very Good

2 (9.1%)

Good

7 (31.8%)

Average

13 (59.1%)

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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