How much does a 0.75 to 0.99ct J SI1 natural marquise diamond cost?

As of October 2026, 0.75 to 0.99ct J SI1 natural marquise diamonds typically cost $1,122 CAD to $3,779 CAD, with a median price of $2,382 CAD. There are currently 71 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 61%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct J SI1 Natural Marquise

Quick answer

As of October 2026, there are 71 natural marquise diamonds with J color and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,122 CAD to $3,779 CAD, with a median of $2,382 CAD. At least 54 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 61%. Half of all listings fall between $1,823 CAD and $3,227 CAD per carat. Over the last 30 days the median price moved -1.8% and the number of listings moved +16.6%.

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

Lowest Price

$633 CAD

Highest Price

$6,149 CAD

Average Price

$2,479 CAD

Market Intelligence

Retailers Selling

Cross Retailer %

31.5%

Price Spread

60.9%

30-Day Price Trend

-1.8%

30-Day Supply Change

+16.6%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,650/ct

10th Percentile

$1,041

Median

$1,650

90th Percentile

$3,099

Score Distribution

239 diamonds scored across 4 quality tiers

Excellent

25 (10.5%)

Very Good

41 (17.2%)

Good

52 (21.8%)

Average

121 (50.6%)

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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