How much does a 0.50 to 0.74ct G SI2 natural marquise diamond cost?

As of November 2026, 0.50 to 0.74ct G SI2 natural marquise diamonds typically cost $746 AUD to $2,016 AUD, with a median price of $1,155 AUD. There are currently 305 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 41%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct G SI2 Natural Marquise

Quick answer

As of November 2026, there are 305 natural marquise diamonds with G colour and SI2 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $746 AUD to $2,016 AUD, with a median of $1,155 AUD. At least 54 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 41%. Half of all listings fall between $1,757 AUD and $2,623 AUD per carat. The same specification in lab grown form lists at a median of about $773 AUD per carat. Over the last 30 days the median price moved -1.1% and the number of listings moved +4.4%.

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 natural stones in the index: 2,268 USD per carat, +10.8% 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: November 2026

Available

305

Lowest Price

$387 AUD

Highest Price

$4,326 AUD

Average Price

$1,304 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

30.8%

Price Spread

40.7%

30-Day Price Trend

-1.1%

30-Day Supply Change

+4.4%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,493/ct

10th Percentile

$1,070

Median

$1,493

90th Percentile

$2,473

Score Distribution

742 diamonds scored across 4 quality tiers

Excellent

127 (17.1%)

Very Good

218 (29.4%)

Good

210 (28.3%)

Average

187 (25.2%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

H SI2H colour is visually identical to G to the naked eye

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Lab-Grown G SI2Same specifications, lab-grown origin

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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