How much does a 0.50 to 0.74ct D SI1 natural marquise diamond cost?

As of October 2026, 0.50 to 0.74ct D SI1 natural marquise diamonds typically cost $893 AUD to $2,727 AUD, with a median price of $1,370 AUD. There are currently 807 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 44%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct D SI1 Natural Marquise

Quick answer

As of October 2026, there are 807 natural marquise diamonds with D colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $893 AUD to $2,727 AUD, with a median of $1,370 AUD. At least 62 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 44%. Half of all listings fall between $2,168 AUD and $3,317 AUD per carat. The same specification in lab grown form lists at a median of about $730 AUD per carat. Over the last 30 days the median price moved -1.4% and the number of listings moved +6.8%.

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: October 2026

Available

807

Lowest Price

$504 AUD

Highest Price

$4,805 AUD

Average Price

$1,655 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

35.7%

Price Spread

43.7%

30-Day Price Trend

-1.4%

30-Day Supply Change

+6.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,846/ct

10th Percentile

$1,310

Median

$1,846

90th Percentile

$3,105

Score Distribution

1.7K diamonds scored across 4 quality tiers

Excellent

362 (21.1%)

Very Good

404 (23.5%)

Good

450 (26.2%)

Average

503 (29.3%)

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Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

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Lab-Grown D SI1Same 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