How much does a 1.00 to 1.49ct J I1 natural marquise diamond cost?

As of November 2026, 1.00 to 1.49ct J I1 natural marquise diamonds typically cost $2,578 AUD to $9,317 AUD, with a median price of $5,931 AUD. There are currently 26 diamonds matching this specification available across retailers.

Where can I find the best price on a J I1 marquise diamond?

About 12% of these diamonds are available at multiple retailers, with an average price spread of 84%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J I1 Natural Marquise

Quick answer

As of November 2026, there are 26 natural marquise diamonds with J colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,578 AUD to $9,317 AUD, with a median of $5,931 AUD. At least 21 retailers stock this exact specification, and 12% of the stones appear at more than one of them, with an average price spread of 84%. Half of all listings fall between $2,214 AUD and $4,960 AUD per carat. Over the last 30 days the median price moved +3.6% and the number of listings moved +1.7%.

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

Lowest Price

$1,118 AUD

Highest Price

$14,280 AUD

Average Price

$5,602 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

12.2%

Price Spread

83.6%

30-Day Price Trend

+3.6%

30-Day Supply Change

+1.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$2,308/ct

10th Percentile

$1,225

Median

$2,308

90th Percentile

$3,900

Score Distribution

155 diamonds scored across 4 quality tiers

Excellent

4 (2.6%)

Very Good

16 (10.3%)

Good

9 (5.8%)

Average

126 (81.3%)

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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