How much does a 0.20 to 0.49ct D SI1 lab grown marquise diamond cost?

As of October 2026, 0.20 to 0.49ct D SI1 lab grown marquise diamonds typically cost $178 NZD to $933 NZD, with a median price of $316 NZD. There are currently 22 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 67%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct D SI1 Lab Grown Marquise

Quick answer

As of October 2026, there are 22 lab grown marquise diamonds with D colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $178 NZD to $933 NZD, with a median of $316 NZD. At least 5 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 67%. Half of all listings fall between $1,003 NZD and $2,337 NZD per carat. The same specification in natural form lists at a median of about $2,639 NZD per carat.

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

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Marquise lab grown stones in the index: 485 USD per carat, -3.2% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

Lowest Price

$122 NZD

Highest Price

$1,611 NZD

Average Price

$419 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

37.5%

Price Spread

67.3%

Price Range

Price per carat distribution across retailers

$1,118/ct

10th Percentile

$475

Median

$1,118

90th Percentile

$1,892

Score Distribution

57 diamonds scored across 4 quality tiers

Excellent

10 (17.5%)

Very Good

18 (31.6%)

Good

16 (28.1%)

Average

13 (22.8%)

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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