How much does a 1.00 to 1.49ct J SI1 natural marquise diamond cost?

As of November 2026, 1.00 to 1.49ct J SI1 natural marquise diamonds typically cost $2,454 AUD to $7,520 AUD, with a median price of $3,780 AUD. There are currently 210 diamonds matching this specification available across retailers.

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

About 35% of these diamonds are available at multiple retailers, with an average price spread of 49%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J SI1 Natural Marquise

Quick answer

As of November 2026, there are 210 natural marquise diamonds with J colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,454 AUD to $7,520 AUD, with a median of $3,780 AUD. At least 56 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 49%. Half of all listings fall between $2,769 AUD and $4,530 AUD per carat. Over the last 30 days the median price moved -0.1% and the number of listings moved +13.7%.

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

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Marquise natural stones in the index: 2,177 USD per carat, -4.2% 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: November 2026

Available

210

Lowest Price

$1,644 AUD

Highest Price

$17,956 AUD

Average Price

$4,579 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

35.4%

Price Spread

49.2%

30-Day Price Trend

-0.1%

30-Day Supply Change

+13.7%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,509/ct

10th Percentile

$1,539

Median

$2,509

90th Percentile

$4,139

Score Distribution

546 diamonds scored across 4 quality tiers

Excellent

60 (11.0%)

Very Good

121 (22.2%)

Good

141 (25.8%)

Average

224 (41.0%)

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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